Question

x square + x - 72 factorise it correctly please !

Answer 1

Answer:

factors: (x+9) and (x-8)

Step-by-step explanation:

= x^2 + x - 72

= x^2 + (9-8)x - 72

= x^2 + 9x - 8x - 72

= x(x+9) -8(x+9)

= (x+9) (x-8)

x= (-9) or x=8

Answer 2

Step-by-step explanation:

x^2 + x -72 = 0

x^2 + 9x - 8x - 72 = 0

x ( x + 9 ) - 8 ( x + 9 ) = 0

( x - 8 ) ( x + 9 ) = 0

x - 8 = 0 and x + 9 = 0

x = 8 and x = -9

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