Question

(2x + 5y)^2 - (2x + 5y)^2

Answer 1

Answer:

=8x2+50y2

Step-by-step explanation:

(2x+5y)2+(2x−5y)2      [Using, (a±b)2=a2±2ab+b2]

=(2x)2+2×2x×5y+(5y)2+(2x)2−2×2x×5y+(5y)2

=4x2+20xy+25y2+4x2−20xy+25y2

=8x2+50y2

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