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Solve 2x2 − 4x − 5 = 0 by completing the square.
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Solve 2x2 − 4x − 5 = 0 by completing the square.
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Mar 17, 2019
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Solve 2x2 − 4x − 5 = 0 by completing the square.
Mathematics
middle-school
Senotrusov
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Senotrusov
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2
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2(x^2-2x+1-1)+5=0
2(x-1)^2+3=0
(x-1)^2=-3/2
x-1=+-√-3÷2
\[x=1+√
\]
and \[x=1-√-3/2\]
Najera
answered
Mar 17, 2019
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Najera
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2
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Rewrite the right side of the equation
in the following way:
.
Then the equation is
and
.
So,
and
The equation has two solutions:
and
.
Tim Kamm
answered
Mar 21, 2019
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Tim Kamm
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