Question

Solve by factorisation method: x2 + x - 20 = 0​

Answer 1

Answer:

3x-20=0

3x=20

x=20%3

x=6.666

Answer 2

x2+x−20=0

⇒x2+5x−4x−20

⇒x(x+5)−4(x+5)=0

⇒(x−4)(x+5)=0