13. Solve 9(x + 5)2 81.

x = -1/5 = -0.5

Step-by-step explanation:

9(x + 5)2 = 81

x = 19

Step-by-step explanation:

9x + 45 x 2 = 81

9x + 90 = 81

      +90   + 90

9x = 171

9       9

x = 19

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

i think is g(1)=-1.

hope that i can