Question

One factor of x^4+x^2-20 is x^2+5.Other factor is x^2-a.Then find the value of a?

Answer 1

Answer:

4

Step-by-step explanation:

The product of two factors is equal to the whole equation.

i. e., (x^2+5)(x^2-a)=x^4+x^2-20

By solving, x^4-ax^2+5x^2-5a=x^4+x^2-20

By equating, 5a=20 => a=4