Question

Find the roots of quadratic equation x² +x-20​

Answer 1

Answer:

x^2 + x - 20

=x^2 + (5 - 4) x - 20

=x^2 + 5x - 4x - 20

=x(x+5)-4(x+5)

=(x+5)(x-4)

Answer 2

Answer :

• Roots of Qudratic Equation are -5 and 4

Given :

• x² + x - 20

To find :

• Roots of Qudratic equation

Solution :

● x² + x - 20 =0

splitting the term

● x² + 5x - 4x - 20 = 0

● x(x + 5) - 4(x + 5) = 0

● (x + 5) (x - 4)

● x + 5 or x - 4 = 0

● x = - 5 0r x = 4

Hence ,

• Roots of Qudratic Equation are -5 and 4

More Explanation:

• Qudratic equation is nothing but an equation that can be written in standard form
• ax² + bx + c = 0
• where a , b and c are real number and a is not equal to zero