Question

Factories: 49x²-1-14 x y+y²​

Answer 1

Answer:

$49 {x}^{2} - 1 - 14xy + {y}^{2} \\ \\ = 49 {x}^{2} - 14xy + {y}^{2} - 1 \\ \\ = {(7x)}^{2} - 2 \times 7x \times y + {y}^{2} - 1 \\ \\ = {(7x - y)}^{2} - {(1)}^{2} \\ \\ = (7x - y - 1)(7x - y + 1)$

Answer 2

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