1.

X square+3x-40=0 factorise it​

Answer»

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


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