Jon invested a total of $1500 in two simple interest accounts. Account A
earns 4% interest and Account B earns
6%. Jon earned a total of $80 interest
after one year. How much did Jon invest
in each account?
A $500 in A, $1000 in B
B $750 in A, $750 in B
C $1000 in A, $500 in B
D $1400 in A, $100 in B

the answer is A.

Step-by-step explanation:

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.