Question

factorise x2-x-72 by splitting the middle term​

Answer 1

• x²-x-72
• x²-(9-8)x-72
• x²-9x+8x-72
• x(x-9)+8(x-9)
• (x+8) (x-9)

Answer 2

Step-by-step explanation:

given equation is

${x}^{2} - x - 72$

write the x in term that product must be -72 and sum is -x

${x}^{2} - 9.x + 8.x - 72$

common the x and 8

$x.(x - 9) + 8.(x - 9)$

now x and 8 have x-9 common

so

(x-9).(x+8)