Asked by Anonymous

From 7x2 – 4x subtract 5x2 + 2x.

I do not understand what order to subtract. Do I subtract like a or b?

a) 7x2 – 4x - 5x2 + 2x

b) 5x2 + 2x - 7x2 – 4x
Answered by Reiny
7x^2 - 4x - (5x^2 + 2x)
= 7x^2 - 4x - 5x^2 - 2x
= 2x^2 - 6x

do the 2nd the same way
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