#12 Bob and Sarah invest $7000 each for 5 years. Bob invests his money at 3.5% simple interest and Sarah invests her money at 3.5% interest compounded annually. How much more interest will Sarah have earned than Bob at the end of the 5 years?
A) $1225.00
B) $1313.80
C) $7090.80
D) $88.80​

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.

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