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4
4
4
. Determine how many REAL solutions the quadratic equation has.
\newline
2
x
2
−
x
5
+
2
=
0
2 x^{2}-x \sqrt{5}+2=0
2
x
2
−
x
5
+
2
=
0
\newline
No real solutions
\newline
One real solution
\newline
Two real solutions
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Math Problems
Precalculus
Factor sums and differences of cubes
Full solution
Q.
4
4
4
. Determine how many REAL solutions the quadratic equation has.
\newline
2
x
2
−
x
5
+
2
=
0
2 x^{2}-x \sqrt{5}+2=0
2
x
2
−
x
5
+
2
=
0
\newline
No real solutions
\newline
One real solution
\newline
Two real solutions
Calculate Discriminant:
To determine the number of real solutions, we can use the discriminant, which is
b
2
−
4
a
c
b^2 - 4ac
b
2
−
4
a
c
from the quadratic formula.
Identify Coefficients:
For the equation
2
x
2
−
x
5
+
2
=
0
2x^2 - x\sqrt{5} + 2 = 0
2
x
2
−
x
5
+
2
=
0
,
a
=
2
a = 2
a
=
2
,
b
=
−
5
b = -\sqrt{5}
b
=
−
5
, and
c
=
2
c = 2
c
=
2
.
Simplify Discriminant:
Now calculate the discriminant:
D
=
b
2
−
4
a
c
=
(
−
5
)
2
−
4
(
2
)
(
2
)
D = b^2 - 4ac = (-\sqrt{5})^2 - 4(2)(2)
D
=
b
2
−
4
a
c
=
(
−
5
)
2
−
4
(
2
)
(
2
)
.
Check Discriminant Sign:
Simplify the discriminant:
D
=
5
−
16
=
−
11
D = 5 - 16 = -11
D
=
5
−
16
=
−
11
.
Conclusion:
Since the discriminant is negative
D
=
−
11
D = -11
D
=
−
11
, there are no real solutions to the equation.
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\newline
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\newline
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\newline
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