(ax+by)²-(bx+ay)²

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(ax+by)²-(bx+ay)²

(ax+by)²-(bx+ay)²
(ax+by)²-(bx+ay)²

(ax+by)²-(bx+ay)²
(ax+by)²-(bx+ay)²
=a²x²+2abxy+b²y²-b²x²-2abxy-a²y²
=(a²-b²)x²-(a²-b²)y²
=(a²-b²)(x²-y²)

(ax+by)²-(bx+ay)²
=(ax+by+bx+ay)(ax+by-bx-ay)
=(a+b)(x+y)(a-b)(x-y)

(ax+by+bx+ay)(ax+by-bx-ay)
=(a+b)(x+y)(a-b)(x-y)