Question

(Picture) MULTIPLYING MONOMIALS AND BINOMIALS

Answer 1

`15 {r}^(2) - 14r - 8`

Answer 2

option D is correct, i.e. (5r+2)(3r-4) = 15r² -14r -8.

Explanation:

Given is (5r+2)(3r-4)

Applying FOIL method:-

F- First two, O- Outer two, I- Inner two, L- Last two.

So, (5r+2)(3r-4) = 5r*3r +5r*-4 +2*3r +2*-4

(5r+2)(3r-4) = 15r² -20r +6r -8

(5r+2)(3r-4) = 15r² -14r -8

Hence, option D is correct, i.e. (5r+2)(3r-4) = 15r² -14r -8.