Question

find the solution (a^2+5) (a^2-4) using the formula (x+a) (x+b) =x^2+(a+b)x+ab​

Answer 1

Answer:

a^4 + a^2 - 20

Step-by-step explanation:

Given,

(a^2+5) (a^2-4)

We know that,

(x+a) (x+b) =x^2+(a+b)x+ab​

By applying this identity, we get,

(a^2+5)(a^2-4) =

= (a^2)^2 + (5 - 4)a^2 + 5(-4)

= a^4 + a^2 - 20

Hence, the required answer is = a^4 + a^2 - 20