Posted by **Esther** on Wednesday, February 23, 2011 at 12:48am.

Add. (1/4x^4+3/4x^3+7/8x^2+9)+(-3x^4+1/8x^2-9. Please help, this is like chinese to me. Thank you.

- Algebra 2 -
**Henry**, Thursday, February 24, 2011 at 8:21pm
X^4/4 + 3X^3/4 + 7X^2/8 + 9 - 3X^4 + X^2/8 - 9,

LCD = 8:

(2X^4 + 6X^3 + 7X^2 -24X^4 +X^2) / 8,

Combine like-terms:

(-22X^4 + 6X^3 + 8X^2) / 8,

Factor out 2x^2:

(2X^2(-11X^2 + 3X + 4) / 8,

Divide numerator and denominator by 2:

X^2(-11X^2 + 3X + 4) / 4

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