Question

Expand ::::: (5x-7y)²
​

Answer 1

Answer:

I think 25x² + 49y² - 70xy is the correct answer.

Answer 2

Answer:

(2x+7y)

2

is of the form (a+b)

2

=a

2

+b

2

+2ab

where a=2x,b=7y

∴(2x+7y)

2

=(2x)

2

+(7y)

2

+2×2x×7y

=4x

2

+49y

2

+28xy

Step-by-step explanation:

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