GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Which of the following equations has no solutions for x?
[#permalink]
24 May 2021, 10:00
24 May 2021, 10:00
Expert Reply
1
Bookmarks
00:00
Question Stats:
56% (01:20) correct
43% (01:19) wrong based on 30 sessions
Hide Show timer Statistics
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?
[#permalink]
26 May 2021, 00:46
26 May 2021, 00:46
explanation plz
Which of the following equations has no solutions for x?
[#permalink]
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
