Question

1. Solve the following quadratic equations by factorisation.

(2) x2 + x - 20 = 0
please answer urgently​

Answer 1

Answer:

2x+x-20=0

3x-20=0

3x=20

x=20/3

x=6.6666

Answer 2

Answer:

X² + X – 20 = 0

⇒ X² + 5X – 4X– 20 = 0

⇒ X (X + 5) – 4(X + 5) = 0

⇒ (X – 4) (X + 5) = 0

⇒ (X – 4) = 0 or(X + 5) = 0

⇒ X = 4 or X = –5

So, 4 and –5 are the roots of the given quadratic equation.⇒