I think the answer is A.
It's probably wanting you to use pythagorean theorem.
Answer – Always
A negative number raised to an odd power is always negative. When a negative number is raised to an even power, the pairs of negatives will cancel out; but when it is raised to an odd power, after pairs of the negative sign have canceled each other out, there will still be one minus sign left unpaired, which will not cancel out.
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Twice (2 times) the difference (subtraction) of a number (y) and 7 equals 3.
2*(y-7) = 3
hope this helps :)
(c+8)(c-8)
3(2y+5)(2y-5)
There are no like terms so it's still ab^2-b
