x^2+7x=9
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Answer:
Explanation:Use the quadratic formula to find the solutions.
−
b±√ b2− 4 ( ac ) 2 a Substitute the valuea = Use the quadratic formula to find the solutions.
−
b
±
√
b
2
−
4
(
a
c
)
2
a
Substitute the values
a
=
1
,
b
=
7
, and
c
=
−
9
into the quadratic formula and solve for
x
.
−
7
±
√
7
2
−
4
⋅
(
1
⋅
−
9
)
2
⋅
1
Simplify.
Tap for more steps...
x
=
−
7
±
√
85
2
The result can be shown in multiple forms.
Exact Form:
x
=
−
7
±
√
85
2
Decimal Form:
x
=
1.10977222
…
,
−
8.10977222
…
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