Math, asked by remsangpuii1981, 4 months ago

how to calculate factorised (7x-9y)2

Answers

Answered by Anonymous

3

Formula:-

${(a - b)}^{2} = (a + b) \times (a - b)$

SOLUTION:-

$=( 7 + 9y) \times( 7 - 9y)$

$= 7(7 - 9y) \times 7(7 + 9y)$

$= 49 - 63y \times 49 + 63y$

$= 49 \times 49$

$= 2401$

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