Question

(Please help) Let f(x) = 3x2 + x - 3 and g(x) = x2 - 5x + 1. Find f(x) - g(x).


2x2 - 4x - 2
2x2 - 4x - 4
2x2 + 6x - 2
2x2 + 6x - 4

Answer 1

f(x) - g(x) = (3x^2 + x - 3) - (x^2 - 5x +1) = (3x^2 + x - 3) - x^2 + 5x - 1 =

2x^2 + 6x - 4.

Answer 2

Thank you so much! Do you think you could help with just one more?

Answer 3

Sure.

Answer 4

Subtract (2x3 + 9x - 8) - (4x2 - 15x + 7).


2x2 - 6x - 1
-2x2 + 24x - 15
2x3 - 4x2 - 6x - 1
2x3 - 4x2 + 24x - 15

Answer 5

Do you think you could explain how it's done a bit?

Answer 6

First distribute the negative between the two equations into the second equation. So it becomes (2x^3 + 9x - 8) - 4x^2 + 15x - 7.

Next, subtract the similar variables! -2x^2 + 24x - 15.

Answer 7

Ok I understand and sort of get it, thank you for the help :)

Answer 8

No problem! :)