CPM Homework Help : AC Problem 3-15

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3-15.

Copy and simplify the following expressions by combining like terms.

$x+3x−3+2x^2+8−5x$
Hint (a):
Flip subtraction to addition.
$x+3x+(−3)+2x^2+8+(−5x)$
More Help (a):
Combine like terms.
Remember you cannot combine $x$ and $x^2$ .
Also remember to put the terms in decreasing order of their exponents.
Answer (a):
$2x^2−x+5$

$2x+4y^2−6y^2−9+1−x+3x$
Hint (b):
See the hints in part (a).
Answer (b):
$−2y^2+4x−8$

$2x^2+30y−3y^2+4xy−14−x$
Hint (c):
See the hints in part (a).
Remember $xy$ cannot be combined with $x$ or $y$ .
Answer (c):
$2x^2−3y^2+4xy+30y−x−14$

$20+3xy−3xy+y^2+10−y^2$
Hint (d):
See the hints in part (a) and part (c).
Answer (d):
$30$

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