The answer is: (z - 6)(z + 15)
z² + 9z - 90 = z*z + 15z - 6z - 6*15 =
= (z*z + 15z) - (6z + 6*15) =
= z(z + 15) - 6(z + 15) =
= (z - 6)(z + 15)
Value of x is -1
The correct first step to solving the inequality is distributing the -4 into the para thesis
Plug the 5 into the x in the equation 2x. it should be 2(5) which equals 10.