how do you factor these? look below please?

Question

Factor 4x2 - 64y2
Factor 9x2 - 8y2
Factor x2 - 16y2
Factor 16x4 - 4y2
Factor 4x4 - y2

Answer 1

4(x^2-16y^2)
4(x-4y)(x+4y)

(x-4y)(x+4y)

4(4x^2-y^2)
4(2x-y)(2x+y)

(2x^2-y)(2x^2+y)

Cant be factored without a positive xy for 9x^2-8y^2)

Answer 2

first, element out effortless phrases: 8x^3(x^4 - 3x^2 + 2) Now we are in a position to element the phrases in parenthesis using opposite FOIL: 8x^3(x^2 - a million)(x^2 - 2) Now the 1st term in parenthesis is distinction of squares, so it rather is added factored: 8x^3(x-a million)(x+a million)(x^2 - 2) that's now completely factored. desire this helps!