(x+1)^2-8(x-1)^2-9=0
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Step-by-step explanation:
Algebra Examples
Popular Problems Algebra Solve Using the Quadratic Formula (x-1)^2-9=0
(
x
−
1
)
2
−
9
=
0
Use the quadratic formula to find the solutions.
−
b
±
√
b
2
−
4
(
a
c
)
2
a
Substitute the values
a
=
1
,
b
=
−
2
, and
c
=
−
8
into the quadratic formula and solve for
x
.
2
±
√
(
−
2
)
2
−
4
⋅
(
1
⋅
−
8
)
2
⋅
1
Simplify.
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Simplify the numerator.
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x
=
2
±
6
2
⋅
1
Multiply
2
by
1
.
x
=
2
±
6
2
Simplify
2
±
6
2
.
x
=
1
±
3
The final answer is the combination of both solutions.
x
=
4
,
−
2
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