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Callahan
Mathematics
18 December, 17:44
2x^2+x-1=2
What can be x
+2
Answers (
2
)
Alexzander Frederick
18 December, 18:06
0
Either x = 1 or x = - 3/2
Step-by-step explanation:
= 2X^2 + x - 1 = 2
= 2x^2 + x - 1 - 2 = 0
= 2x^2 + x - 3 = 0
now the above equation has become quadratic equation so we apply the quadratic formula which is:
x = (-b ± √ b^ 2 - 4ac) / 2a
here,
a=2, b=1 and c=-3
putting the values in the formula:
x = (-1 ± √ (1) ^ 2 - 4 (2) (-3)) / 2 (2)
x = (-1 ± √ (1) + 24)) / (4)
x = (-1 ± √ 25) / (4)
x = (-1 ± 5) / (4)
now,
Either: x = (-1 + 5) / (4) or: x = (-1 - 5) / (4)
x = (4) / (4) x = (-6) / (4)
x = 1 x = - 3/2
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Allyson Mcdonald
18 December, 18:09
0
Answer:Two solutions were found:
x = (2-√20) / 8 = (1-√ 5) / 4 = - 0.309
x = (2+√20) / 8 = (1+√ 5) / 4 = 0.809
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