Question

Simplify using the horizontal method.

(2n2 + 4n + 4)(4n – 5)
a.
8n3 + 4n2 – 6n – 20
b.
8n3 + 26n2 – 36n – 20
c.
8n3 – 6n2 + 36n – 20
d.
8n3 + 6n2 – 4n – 20

Answer 1

(2n2 + 4n + 4)(4n – 5)
= 8n^3 + 16n^2 +16n -10n^2 - 20n - 20
= 8n^3 +6n^2 -4n - 20

answer is d.
8n3 + 6n2 – 4n – 20