Quadratic equation
Solve a quadratic equation:
2x
2
+28x-550=0
Correct answer:
x
1
=
11
x
2
=
-25
Step-by-step explanation:
2
x
2
+
2
8
x
−
5
5
0
=
0
2
x
2
+
2
8
x
−
5
5
0
=
0
2
x
2
+
2
8
x
−
5
5
0
=
0
2
.
.
.
prime number
2
8
=
2
2
⋅
7
5
5
0
=
2
⋅
5
2
⋅
1
1
GCD
(
2
,
2
8
,
5
5
0
)
=
2
x
2
+
1
4
x
−
2
7
5
=
0
a
=
1
;
b
=
1
4
;
c
=
−
2
7
5
D
=
b
2
−
4
a
c
=
1
4
2
−
4
⋅
1
⋅
(
−
2
7
5
)
=
1
2
9
6
D
>
0
x
1
,
2
=
2
a
−
b
±
D
=
2
−
1
4
±
1
2
9
6
x
1
,
2
=
2
−
1
4
±
3
6
x
1
,
2
=
−
7
±
1
8
x
1
=
1
1
x
2
=
−
2
5
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quadratic equation
arithmetic
square root
Grade of the word problem:
practice for 14 year olds
high school
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