Factor the expression and exlplain
20b - 16

4(5b-4)

Step-by-step explanation:

20b -16

Both terms are divisible by 4 so we can factor out a 4

4*5b -4*4

4(5b-4)

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.

the answer is 62.8 cubic units