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(3x-4y)² = 9x²-24xy+16y²
(5-6y)² = 25-60y+36y²
(2x-3y)(2x+3y) = 4x²-9y²
81x² -25y² = (9x-5y)(9x+5y)
(√2-y)² = 2-2√2y+y²
9y² -16x² = (3y-4x)(3y-4x)
(3y+2y)² = 25y²
(y-2x)² = y²-4xy+4x²