anonymous
  • anonymous
How can you tell when a quadratic equation has no real solutions? A. when the radicand is negative B. when b in the quadratic formula is greater than the radicand C. when the radicand equals zero D. when the radicand is not a perfect square I believe the answer is A? is that right?
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Mertsj
  • Mertsj
A
campbell_st
  • campbell_st
its A using the discriminant \[b^2 - 4ac\] < 0 no real solutions the radical will be negative
experimentX
  • experimentX
whats radicand anyway??

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

experimentX
  • experimentX
i go with campbell
campbell_st
  • campbell_st
the square root symbol
Mertsj
  • Mertsj
b^2-4ac
Mertsj
  • Mertsj
\[x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]
anonymous
  • anonymous
Thanks!! :) I also have this one... For which value of x does the graph of y = 2x2 − 7x + 6 cross the x-axis? A. −3/2 B. −2/3 C. 2 D. 3 I think its C.
Mertsj
  • Mertsj
\[b^2-4ac\] is the discriminant
Mertsj
  • Mertsj
You are correct.
campbell_st
  • campbell_st
you can substitute each value to find y = 0 or factorise (2x - 3)(x - 2) = 0 x = 3/2 and 2
anonymous
  • anonymous
Thanks so much, here's another one i'm stuck on... What are the approximate solutions of 4x2 + 3 = −12x to the nearest hundredth? A. x ≈ −3.23 and x ≈ 0.23 B. x ≈ −2.72 and x ≈ −0.28 C. x ≈ 0.28 and x ≈ 2.72 D. x ≈ −0.23 and x ≈ 3.23 I think its C, but I'm not sure??
campbell_st
  • campbell_st
put it in standard form 4x^2 + 12x + 3 = 0 use the general quadratic formula \[x = (-b \pm \sqrt{b^2 - 4ac})/2a\] in your question a = 4, b = 12 and c = 3
Mertsj
  • Mertsj
C is correct.
anonymous
  • anonymous
thanks so much!! :)
Mertsj
  • Mertsj
No. It's B
Mertsj
  • Mertsj
Both roots are negative.
anonymous
  • anonymous
B? Really? are you sure?
anonymous
  • anonymous
Okay, i'll trust you! :)
Mertsj
  • Mertsj
\[x=\frac{-12\pm \sqrt{96}}{8}\]
anonymous
  • anonymous
I have one more question that's really confusing me, would you mind sticking around for one more?
Mertsj
  • Mertsj
\[x=\frac{-12+9.80}{8} or x=\frac{-12-9.80}{8}\]
Mertsj
  • Mertsj
ok
anonymous
  • anonymous
*note* don't ask me why the numbers are spreed out like that, I just copied and pasted it onto here, that how it looks on my paper. Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring? −b b2 − 4ac 2a Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation: 2x2 + 7x + 3 = 0
Mertsj
  • Mertsj
b^2-4ac
anonymous
  • anonymous
is that the answer?
Mertsj
  • Mertsj
Well which part would you choose? -b? 2a????
Mertsj
  • Mertsj
\[b^2-4ac=7^2-4(2)(3)=49-24=25\]
anonymous
  • anonymous
I don't know... This is really confusing me for some reason...
anonymous
  • anonymous
so the answer is b^2-4ac?
anonymous
  • anonymous
I'm still confused... :/
anonymous
  • anonymous
or is the answer this: b² - 4ac = (7)² - 4(2)(3) = 49 - 24 = 25.
Mertsj
  • Mertsj
The discriminant, which is b^2-4ac, is the part of the quadratic formula which tells you about the roots.
Mertsj
  • Mertsj
Do you understand that the question has two parts? READ THE QUESTION!!!
Mertsj
  • Mertsj
PART 1: Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring?
Mertsj
  • Mertsj
The answer to that is :b^2-4ac
Mertsj
  • Mertsj
PART 2: Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation: 2x2 + 7x + 3 = 0
Mertsj
  • Mertsj
The answer to that is 25
anonymous
  • anonymous
ohhh okay, I understand now
anonymous
  • anonymous
Thank you!!
Mertsj
  • Mertsj
yw
anonymous
  • anonymous
I just wasn't looking at the problem correctly, sorry for the confusion and thanks again for breaking it down for me

Looking for something else?

Not the answer you are looking for? Search for more explanations.