Question

Subtract.
(9x8+ 4x7 + 7x6 – 2) – (7x8 + 3x7 + 7x6 – 2)

Answer 1

we can only add and subtract like terms

Answer 2

\[\LARGE (+)\cdot (-)=(-)\]
\[\LARGE (-)\cdot (+)=(-)\]
\[\LARGE (-)\cdot (-)=(+)\]
\[\LARGE (+)\cdot (+)=(+)\]

Answer 3

9x^8 + 4x^7 + 7x^6 - 2 - 7x^8 - 3x^7 - 7x^6 +2
=2x^8 + x^7

Answer 4

collect the like terms

\[(9 - 7)x^2 +(4 - 3)x^7 +(7 - 7)x^6 +(-2 + 2) = 2x^8 + x^7\]