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\[(9{x}^{2}-8x-9)-(9{x}^{3}-9{x}^{2}-x-9)\]
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(9x^2-8x-9)-(9x^3-9x^2-x-9)
(9x2-8x-9)-(9x3-9x2-x-9)
({9x}^{2}-8x-9)-({9x}^{3}-{9x}^{2}-x-9)
1
Remove parentheses.
9
x
2
−
8
x
−
9
−
9
x
3
+
9
x
2
+
x
+
9
9{x}^{2}-8x-9-9{x}^{3}+9{x}^{2}+x+9
9
x
2
−
8
x
−
9
−
9
x
3
+
9
x
2
+
x
+
9
2
Collect like terms.
(
9
x
2
+
9
x
2
)
+
(
−
8
x
+
x
)
+
(
−
9
+
9
)
−
9
x
3
(9{x}^{2}+9{x}^{2})+(-8x+x)+(-9+9)-9{x}^{3}
(
9
x
2
+
9
x
2
)
+
(
−
8
x
+
x
)
+
(
−
9
+
9
)
−
9
x
3
3
Simplify.
18
x
2
−
7
x
−
9
x
3
18{x}^{2}-7x-9{x}^{3}
1
8
x
2
−
7
x
−
9
x
3
Done
18*x^2-7*x-9*x^3
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