Question

(4x-5y)² please do fast
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Answer 1

Answer:

$16x {}^{2} - 40xy + 25y {}^{2}$

is the answer mate..........

Answer 2

Answer:

We know that

${(x - y)}^{2} = {x}^{2} + {y}^{2} - 2xy$

Similarly,

${(4x - 5y)}^{2} = {(4x)}^{2} + {(5y)}^{2} - 2(4x)(5y) \\ \\ = 16 {x}^{2} + 25 {y}^{2} - 40xy$