Question

$- 4x {}^{2} + 4xy - y {}^{2}$

$p {}^{2} - 2pq + q {}^{2}$
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Answer 1

Answer:

Step-by-step explanation:

-4x² + 4xy - y² = - (4x² - 4xy + y²) = - (2x - y)²

p² - 2pq +q²  = (p-q)²

Answer 2

Answer:

-(2x-y) (2x-y)

(p-q) (p-q)

Step-by-step explanation:

formula --->

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(a-b) ^2=a^2+b^2+2ab