Back to Practicehard • Past Paper

Factorize x^4 - 7x^2 + 1.

A(x^2+3x+1)(x^2-3x+1)

B(x^2-3x-1)(x^2+3x-1)

C(x^2+x+1)(x^2-x+1)

D(x^2-1)^2-5x^2