Can someone help me with my math ^^

The question is in the picture

Question

Can someone help me with my math ^^

The question is in the picture

person321 · Answer

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jhonyy9 · Answer

in  what case you see this form of

a^2 -b^2

person321 · Answer

thats not in any of them, thats why I'm confused

Angle · Answer

@person321

it doesn't look directly like that formula because you need to factor out the greatest common factors first.

For example:
We can factor out a (5x^2) out of  $5x^4+20x^2$
so that it looks like
$5x^2 (x^2 + 4)$

then we can see that the $x^2+4$ is technically a "sum of perfect squares" but since we want the DIFFERENCE of perfect squares, E is NOT an answer - but that show's you the strategy

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