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\[(a+b)^2=a^2+2ab+b^2\]

Is that the formula to use?

200w^2 + 640wf +512f^2 is of the form a^2+2ab+b^2

Understood?

Yes

What answer do you get?

I'm confused

First represent 200w^2 as a^2

200 can be written as 2*100
Find the square root of 200w^2

Square root is 100 right?

What is the sqrt of 100?

10

10

What is the square root of 2*100?