Question

4r3 +8r2 −5r−10? It = to

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

Answer 1

4r^3+8r^2-5r-10

= 4r^2(r+2)-5(r+2) [Factorise out like terms; distributive law of multiplication to check]

=(4r^2-5)(r+2) [Combine expressions]