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Which of the following equations has no solutions for x?
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24 May 2021, 10:00
24 May 2021, 10:00
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Question Stats:
53% (01:14) correct
46% (01:17) wrong based on 26 sessions
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Which of the following equations has no solutions for x?
A. \(x^2+8x=-17\)
B. \(x^2+8x=-13\)
C. \(x^2+8x=0\)
D. \(x^2+8x=1\)
E. \(x^2+8x=16\)
A. \(x^2+8x=-17\)
B. \(x^2+8x=-13\)
C. \(x^2+8x=0\)
D. \(x^2+8x=1\)
E. \(x^2+8x=16\)
Re: Which of the following equations has no solutions for x?
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26 May 2021, 00:46
26 May 2021, 00:46
explanation plz
Which of the following equations has no solutions for x?
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26 May 2021, 13:45
26 May 2021, 13:45
1
Expert Reply
We should use the quadratic formula.
x= \(\frac{-b \pm \sqrt{b^2-4ac}}{2a}\)
the discriminant is \(b^2-4ac\)
so it would be best if you calculated each answer choice, and when negative, we do not have solutions
The first one, for instance, the first one
\(x^2+8x+17=0\)
It will be \(8^2-4*1*17=-4\)
A has no solution and therefore is the right answer
x= \(\frac{-b \pm \sqrt{b^2-4ac}}{2a}\)
the discriminant is \(b^2-4ac\)
so it would be best if you calculated each answer choice, and when negative, we do not have solutions
The first one, for instance, the first one
\(x^2+8x+17=0\)
It will be \(8^2-4*1*17=-4\)
A has no solution and therefore is the right answer
