Question

factorise x4 - 11x2 – 80​

Answer 1

Answer:

(x²-16)(x²+5)

step-by-step explanation :

=x4-11x²-80

=x4-16x²+5x²-80

=x²(x²-16)+5(x²-16)

=(x²-16)(x²+5)

hope it helps you.