substitute the polynomials

Question

(-5r^2+5r+4)-(7r^2+4)

Answer 1

Given polynomials -5r^2+5r+4, 7r^2+4

Subtract 7r^2+4 from -5r^2+5r+4

-5r^2+5r+4

7r^2      +4

(-)         (-)

_________

-12r^2+5r