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 2 years ago
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?
 2 years ago
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?

This Question is Closed

campbell_st
 2 years ago
Best ResponseYou've already chosen the best response.3its A using the discriminant \[b^2  4ac\] < 0 no real solutions the radical will be negative

experimentX
 2 years ago
Best ResponseYou've already chosen the best response.1whats radicand anyway??

campbell_st
 2 years ago
Best ResponseYou've already chosen the best response.3the square root symbol

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0\[x=\frac{b \pm \sqrt{b^24ac}}{2a}\]

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks!! :) I also have this one... For which value of x does the graph of y = 2x2 − 7x + 6 cross the xaxis? A. −3/2 B. −2/3 C. 2 D. 3 I think its C.

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0\[b^24ac\] is the discriminant

campbell_st
 2 years ago
Best ResponseYou've already chosen the best response.3you can substitute each value to find y = 0 or factorise (2x  3)(x  2) = 0 x = 3/2 and 2

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks 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
 2 years ago
Best ResponseYou've already chosen the best response.3put 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
 2 years ago
Best ResponseYou've already chosen the best response.0Both roots are negative.

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0B? Really? are you sure?

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0Okay, i'll trust you! :)

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0\[x=\frac{12\pm \sqrt{96}}{8}\]

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0I have one more question that's really confusing me, would you mind sticking around for one more?

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0\[x=\frac{12+9.80}{8} or x=\frac{129.80}{8}\]

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0*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
 2 years ago
Best ResponseYou've already chosen the best response.0Well which part would you choose? b? 2a????

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0\[b^24ac=7^24(2)(3)=4924=25\]

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0I don't know... This is really confusing me for some reason...

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0so the answer is b^24ac?

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0I'm still confused... :/

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0or is the answer this: b²  4ac = (7)²  4(2)(3) = 49  24 = 25.

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0The discriminant, which is b^24ac, is the part of the quadratic formula which tells you about the roots.

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0Do you understand that the question has two parts? READ THE QUESTION!!!

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0PART 1: Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring?

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0The answer to that is :b^24ac

Mertsj
 2 years ago
Best ResponseYou've already chosen the best response.0PART 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
 2 years ago
Best ResponseYou've already chosen the best response.0The answer to that is 25

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0ohhh okay, I understand now

Renee99
 2 years ago
Best ResponseYou've already chosen the best response.0I just wasn't looking at the problem correctly, sorry for the confusion and thanks again for breaking it down for me
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