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

Question

"Please help me solve this"

Answer 1

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.