Question

expand (-3x+5y)^2 please expand it fast

Answer 1

After applying an algebric identity,
(a + b) ² = a² + b² + 2ab,
$\: \: \: {(5y - 3x)}^{2} \\ = {(5y)}^{2} + {( - 3x)}^{2} + 2(5y)( - 3x) \\ = 25 {y}^{2} + {9x}^{2} - 30xy.$




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