Expand the function f(x)=(x+7)³

Step-by-step explanation:

you can use the (a+b)² = a²+b²+2ab

(x+7)(x+7)²= (x+7)(x²+49+14x) = x³+49x+14x²+7x²+343+98x = x³+21x²+147x+343

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.

there is no grid

step-by-step explanation: