Question

$2(x - 2y) {}^{2} - 50y { }^{2}$
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Answer 1

Answer:

$2(x - 2y)^{2} - 50y ^{2} \\ = 2(x - 2y)^{2} - 2 \times 25y^{2} \\ = 2 {(x - 2y)^{2} - (5y)^{2} }\\ = 2{(x - 2y + 5)(x - 2y - 5)}$

hope you will understand the last line