Question

plz solve dis all sums asap​

Answer 1

$\huge{\red{\mathfrak{heyya \: mate}}}$

$\huge{ \mathtt{ \green{answers}}}$

$1. \: (3x + 7y) {}^{2} \\ = {3x}^{2} + {7y}^{2} + 2 \times 3x \times 7y \\= {3x}^{2} + {7y}^{2} + 42xy$

$2. {(x - 4)}^{2} \\ = {x}^{2} + {4}^{2} - 2 \times x \times 4 \\ = {x}^{2} + 16 - 8x \\ = {x}^{2} - 8x + 16$

$3.{79}^{2} - {69}^{2} \\ = 6241 - 4761 \\ = 1480$

HOPES IT WILL HELP YOU MATE

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