Back to Practicehard • Past Paper

Factorize completely: x^4 - 13x^2 + 36.

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

B(x^2-9)(x^2-4)

C(x-6)(x+6)(x-1)(x+1)

D(x-4)(x+4)(x-9)(x+9)