Question

Find the difference of (−4x2 − 7x3 − 2) − (8x3 + 3x − 7x2)

Answer 1

distribute the - into the second parenthesis...this will make it addition instead of subtraction

Answer 2

please show work im trying to learn it .

Answer 3

(−4x2 − 7x3 − 2) − (8x3 + 3x − 7x2)

when i say distribute...i mean
what is - times 8x^3?
what is - times 3x?
what is - times -7x²?

this all becomes

(−4x^2 − 7x^3 − 2) + (-8x^3 - 3x + 7x^2)

now

what is

-4x^2 + 7x^2?
-7x^3 + -8x^3?

Answer 4

-4x^2 + 7x^2 ? ...this is 3x^2
-7x^3 + -8x^3 ?....this is -15x^3

so we have all we need

-15x^3 + 3x^2

(dont forget the -3x and -2 we left behind)

-15x^3 + 3x^2 -3x -2

would be our difference

Answer 5

thank you <3

Answer 6

anytime :)

just remember this

you cannot combine a number with x^3....with ANYTHING other than ANOTHER number with x^3

same for x

same for x^2

same for constant numbers....you cannot combine say 2 and 3x

they just stay the same

remember those and you'll do great :)