## Which of the quadratic equation has two real equal roots?

We know that quadratic equation has two equal roots only when the value of discriminant is equal to zero. We know that two roots of quadratic equation are equal only if discriminant is equal to zero. , we cannot have k =0. Therefore, we discard k=0.

## How do you find if a quadratic equation has real roots?

The value of the discriminant shows how many roots f(x) has: – If b2 – 4ac > 0 then the quadratic function has two distinct real roots. – If b2 – 4ac = 0 then the quadratic function has one repeated real root. – If b2 – 4ac < 0 then the quadratic function has no real roots.

## Is the roots of a quadratic equation will always be a real number?

Clearly, −b2a is a real number because b and a are real. Thus, the roots of the equation ax2 + bx + c = 0 are real and equal if b2 – 4ac = 0.

Examine the Roots of a Quadratic Equation.
Discriminant of ax2 + bx + c = 0Nature of roots of ax2 + bx + c = 0Value of the roots of ax2 + bx + c = 0
b2 – 4ac < 0Not realNo real value

## Which of the quadratic equation has no real roots?

Therefore, to find the roots of a quadratic function, we set f (x) = 0, and solve the equation, ax2 + bx + c = 0. 1. b2 −4ac < 0 There are no real roots.

## Which of the following quadratic equations have no real roots?

Answer: A quadratic equation, ax2 + bx + c = 0; a ≠ 0 will have two distinct real roots if its discriminant, D = b2 – 4ac > 0. Hence, the equation x2 –3x + 4 = 0 has no real roots.

## Is quadratic equation all real numbers?

The range of quadratic functions, however, is not all real numbers, but rather varies according to the shape of the curve. Specifically, For a quadratic function that opens upward, the range consists of all y greater than or equal to the y-coordinate of the vertex.

## How can you say that the roots of quadratic equation are real or not real numbers rational or irrational numbers equal or not equal?

If is positive, the roots are real. If is negative (i.e. non-positive), the roots are complex. If is a perfect square or it can be expressed as a fraction where both and are perfect squares and q is non-zero, the roots are rational. If is strictly positive, the roots are real and distinct.

## What is real number in quadratic equation?

A quadratic equation is of the form ax2 + bx + c = 0 where a, b and c are real number values with a not equal to zero. This quadratic equation is not factorable, so we apply the quadratic formula. Notice that after combining the values, we are left with a negative value under the square root radical.

## How do you know how many roots a quadratic equation has?

To work out the number of roots a qudratic ax2+bx+c=0 you need to compute the discriminant (b2​-4ac). If the discrimant is less than 0, then the quadratic has no real roots. If the discriminant is equal to zero then the quadratic has equal roosts. If the discriminant is more than zero then it has 2 distinct roots.

## How do you find the roots of a quadratic equation?

For a quadratic equation ax2 + bx + c = 0,
1. The roots are calculated using the formula, x = (-b ± √ (b² – 4ac) )/2a.
2. Discriminant is, D = b2 – 4ac. If D > 0, then the equation has two real and distinct roots. If D < 0, the equation has two complex roots. …
3. Sum of the roots = -b/a.
4. Product of the roots = c/a.

## What is the value of the discriminant whose roots are real rational and equal?

Δ=0
The discriminant (EMBFQ)
Nature of rootsDiscriminant
Roots are non-realΔ<0
Roots are real and equalΔ=0
Roots are real and unequal: rational roots irrational rootsΔ>0 Δ= squared rational Δ= not squared rational

## How do you find real roots?

Here’s how Descartes’s rule of signs can give you the numbers of possible real roots, both positive and negative:
1. Positive real roots. For the number of positive real roots, look at the polynomial, written in descending order, and count how many times the sign changes from term to term. …
2. Negative real roots.

## How do you find the real roots?

You can find the roots, or solutions, of the polynomial equation P(x) = 0 by setting each factor equal to 0 and solving for x. Solve the polynomial equation by factoring. Set each factor equal to 0. 2×4 = 0 or (x – 6) = 0 or (x + 1) = 0 Solve for x.

## What is real roots of an equation?

Given an equation in a single variable, a root is a value that can be substituted for the variable in order that the equation holds. In other words it is a “solution” of the equation. It is called a real root if it is also a real number. For example: x2−2=0.

## What are real and equal roots?

When a, b, and c are real numbers, a ≠ 0 and the discriminant is zero, then the roots α and β of the quadratic equation ax2+ bx + c = 0 are real and equal.

## What are the real root?

The terms solutions/zeros/roots are synonymous because they all represent where the graph of a polynomial intersects the x-axis. The roots that are found when the graph meets with the x-axis are called real roots; you can see them and deal with them as real numbers in the real world.

## What are equal and unequal roots?

When discriminant is greater than zero, the roots are unequal and real. When discriminant is equal to zero, the roots are equal and real. When discriminant is less than zero, the roots are imaginary.

## What are equal roots?

A quadratic equation has equal roots iff its discriminant is zero. A quadratic equation has equal roots iff these roots are both equal to the root of the derivative.