Question

Please help !! Simplify the following expression
x^4+3x^3-2x^3-5x^2-x+x^2+x+1+7x^4
A. 8x^4+x^3-4x^2+0x
B. 8x^4+x^3-4x^2+1
C. 8x^4+5x^3+4x^2+0x+1
D. 8x^4+5x^3+4x^2+1

Answer 1

8x^4 + x^3 - 4x^2 +1. I believe the answer is B. Please correct me if I am wrong.

Answer 2

$x^{4} + 3 x^{3} - 2x^{3} - 5 x^{2} - x + x^{2} + x + 1 + 7 x^{4}$

Collect the terms. Meaning, collect all exponents in to one whole exponent (e.g. combine the x^4 and 7x^4).

$8x^{4} + x^{3} - 4 x^{2} + 1$

Therefore your answer is [B].