Answer:
x=1,-9
Step-by-step explanation:
Move all terms to the left side of the equation and simplify.
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x
2
+
8
x
−
9
=
0
Use the quadratic formula to find the solutions.
−
b
±
√
b
2
−
4
(
a
c
)
2
a
Substitute the values
a
=
1
,
b
=
8
, and
c
=
−
9
into the quadratic formula and solve for
x
.
−
8
±
√
8
2
−
4
⋅
(
1
⋅
−
9
)
2
⋅
1
Simplify.
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x
=
−
4
±
5
The final answer is the combination of both solutions.
x
=
1
,
−
9
