a + B for the quadratic equation x? - 10 x + 9-0 is
A) 10
B)-10 C)9
D) 90
Answers
Answered by
0
Answer:
The quadratic formula is
x
=
−
b
±
2
√
b
2
−
4
a
c
2
a
where
a
,
b
, and
c
are the coefficients of the terms of the quadratic equation
For your equation we have
x
2
+
10
x
+
9
=
0
⇒
x
=
−
10
±
2
√
10
2
−
4
(
1
)
(
9
)
2
(
1
)
⇒
x
=
−
10
±
2
√
100
−
36
2
⇒
x
=
−
10
±
2
√
64
2
⇒
x
=
−
10
±
8
2
⇒
x
=
−
10
+
8
2
,
x
=
−
10
−
8
2
⇒
x
=
−
1
,
x
=
−
9
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