NEED HELP!! Jimmy is trying to figure out how many pennies are in his bank. He asked his mother to help him figure out the total

Question

3 years ago

9

NEED HELP!! Jimmy is trying to figure out how many pennies are in his bank. He asked his mother to help him figure out the total

. He tells her to let the amount in the bank equal 21X^3+18X^2+9X and each penny equal 3x. Can you help them figure out how many pennies are in the bank? A.7X^2+6X+3 B.21X^2+18X+9 C.7X^4+6X^3+3X D.21X^4+18X^3+9

Mathematics

1 answer:

aleksklad [387] · Answer 1 · 2022-07-10T10:17:03+03:00

aleksklad [387]3 years ago

8 0

Factor out 3x. In other words, divide each term by 3x.

21x^3 + 18x^2 + 9x

Note: instead of dividing by 3x you can split it up; divide by 3 and then divide by x.

21x^3 / 3 = 7x^3
7x^3 / x = 7x^2

18x^2 / 3 = 6x^2
6x^2 / x = 6x

9x / 3 = 3x
3x / x = 3

A. 7x^2 + 6x + 3