Posted by **esther** on Thursday, February 24, 2011 at 3:17pm.

Add(1/12X^4+6/7X^3+3/8X^2+5)+ (-7/12X^4+5/8X^2-5).

"Please help me solve this"

- algebra 2 -
**Henry**, Saturday, February 26, 2011 at 4:39pm
X^4/12 + 6X^3/7 + 3X^2/8 + 5 7X^4/12

+ 5X^2/8 - 5.

LCD = 168.

(14X^4 + 144X^3 + 63X^2 - 98X^4 + 105X^2) / 168,

Combine like-terms:

(-84X^4 + 144X^3 + 168X^2) / 168,

Factor out 12X^2:

12X^2(-7X^2 + 12X + 14) / 168,

Divide numerator and denominator by 12 and get:

X^2(-7X^2 + 12X + 14) / 14.

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