Question

factorise :
${x}^{3} + 8 {x}^{2} + 9x - 18$

Answer 1

Answer:

Step-by-step explanation:

Look for three number which have product of -18 and sum of 8

the three numbers are 9,-2,1

Since the coefficient of x^3 is 1

f(x) = (x+9)(x-2)(x+1)