Question

x^3++x^2=81x+81

Answer 1

x^2(x+1) = 81(x+1) : divide both sides by (x+1) to cancel out
x^2 = 81 : solve for x
x = 9 or x = -9

Answer 2

x_1,_2=+/-9

Answer 3

ddrfighter2 - not

Answer 4

,,or" is -9 ,,and" +9