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Algebra
Evaluate (x^2+3x-9)(4-x)^-1
(
x
2
+
3
x
−
9
)
(
4
−
x
)
−
1
(
x
2
+
3
x
-
9
)
(
4
-
x
)
-
1
Step 1
Rewrite the
expression
using the negative
exponent
rule
b
−
n
=
1
b
n
b
-
n
=
1
b
n
.
(
x
2
+
3
x
−
9
)
1
4
−
x
(
x
2
+
3
x
-
9
)
1
4
-
x
Step 2
Multiply
x
2
+
3
x
−
9
x
2
+
3
x
-
9
by
1
4
−
x
1
4
-
x
.
x
2
+
3
x
−
9
4
−
x
x
2
+
3
x
-
9
4
-
x
⎡
⎢
⎣
x
2
1
2
√
π
∫
x
d
x
⎤
⎥
⎦
[
x
2
1
2
π
∫
x
d
x
]
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