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(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab - b²
a² - b² = (a-b)(a+b)
a) (2x+5y²)² = 4x² + 20xy² + 25y⁴
b) (√3x-4y) ² = 3x² - 8√3xy + 16y²
c) (√2x+√3y) (√2x-√3y) = 2x² - 3y²
d) (-3x+5y) ² = 9x² - 30xy + 25y²
e) (3x²+5y) ² = 9x⁴ + 30x²y + 25y²
f) (√2x+3y) ² = 2x² + 6√2xy + 9y²
g) (√3x+√2y) (√3x-√2y) = 3x² - 2y²
h) (-5x+3y) ² = 25x² - 30xy + 9y²