Question

Express (a+3)(a-4) as a trinomial​

Answer 1

`a^(2) -a-12`

Explanation:

One way is to ensure that each term in the second bracket is multiplied by each term in the first bracket, as shown below.

(a+3) - (a - 4)

=a(a−4)+3(a−4)

distribute the brackets.

=
`a^(2)`−
`4a`+
`3a`−12

collecting like terms gives.

=
`a^(2)` −
`a` − 12 ← as a trinomial