Question

(a+3d)x(a+d)x(a-d)x(a-3d)​

Answer 1

(a^2+ad+3da+3d^2)(a^2-3ad-ad+3d^2)

(a^2+3d^2+4ad)(a^2+3d^2-4ad)

=a^4+9d^4+6a^2d^2-16a^2d^2

=(a^4)+(9d^4)-10(a^2d^2)

MARK BRAINLIEST.