Question

x square+3x-40=0 factorise it​

Answer 1

Answer:

x = 5 and -8

Step-by-step explanation:

x²+3x-40 = 0

(x-5)(x+8) = 0

x-5 = 0 => x = 5

x+8 = 0 => x = -8

or

x²+3x-40 = 0

x²+8x-5x-40 = 0

x(x+8)-5(x+8) = 0

(x-5)(x+8) = 0

x-5 = 0 => x = 5

x+8 = 0 => x = -8