anonymous
  • anonymous
Which of the following equations is quadratic? x(x2 + 1) = 0 5(4x + 2) = 3 (x + 3)(x + 4) = 5
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
The third one :)
anonymous
  • anonymous
And how did you get to that?
anonymous
  • anonymous
I'll show you the solution in 5 minutes if you don't mind :)

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anonymous
  • anonymous
ok. Sounds good.
anonymous
  • anonymous
First one is x(x2 + 1) = 0 Solution will be x^3+x=0 Second one is 5(4x + 2) = 3 Solution will be 20x+10=3 Third one is (x + 3)(x + 4) = 5 Solution will be x^2+4x+3x+12=2 Example of Quadratic exquation is x^2+x+3=0 The first and second is linear equation because example of linear equation is x+3=0 I hope I didn't confuse you :)
anonymous
  • anonymous
I think I mainly understand? But could you explain the solution to the 3rd one? Like how you got x^2+4x+3x+12=2 as the solution?
anonymous
  • anonymous
Sorry sorry the first is cubic,the second is linear and the third is quadratic
anonymous
  • anonymous
ohh. Nvm. I understand.
anonymous
  • anonymous
How do we get (x + 3)(x + 4) = 5 from x^2+4x+3x+12=2 though?
anonymous
  • anonymous
Umm listen i got it by multiplying both of them sorry the answer is x^2+4x+3x+12=5 so the final answer is x^2+7x+12=5 :)
anonymous
  • anonymous
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anonymous
  • anonymous
Hmm. I see how you'd get that, but it's not one of the answers I get to choose from =/
anonymous
  • anonymous
Then?
anonymous
  • anonymous
You asked which of the following is quadratic i told you the third one is quadratic :) Finishhhhhhhhhhhhhhh
anonymous
  • anonymous
I'm confused, if the 3rd one is quadratic, then what does x^2+7x+12=5 have to do with it? Sorry, I'm just confused.
anonymous
  • anonymous
Like how does x^2+7x+12=5 help me get to (x + 3)(x + 4) = 5 ?
anonymous
  • anonymous
Is it bc when I factor out (x + 3)(x + 4) = 5 I get x^2+7x+12=5? And therefore the third one is right bc they both equal 5?
anonymous
  • anonymous
Wait I'll explain you in a while :)
anonymous
  • anonymous
Ok. Sorry.
anonymous
  • anonymous
See the question is Which of the following equations is quadratic? x(x2 + 1) = 0 5(4x + 2) = 3 (x + 3)(x + 4) = 5 Okay? So now I'll solve i mean we will open the brackets to know which one is quadratic okay? :)
anonymous
  • anonymous
ok
anonymous
  • anonymous
So now I'll solve line by line First one is x(x2 + 1) = 0 Solution will be x^3+x=0 This is a type of cubic because the first exponent(power) is 3 Second one is 5(4x + 2) = 3 Solution will be 20x+10=3 This is a type of linear equation because the first exponent(power) is 1 Third one is (x + 3)(x + 4) = 5 Solution will be x^2+4x+3x+12=5 x^2+7x+12=5 This is an example of quadratic equation because the first exponent(power) is 2 So the answer to your question is the third one Got it? :)
anonymous
  • anonymous
Ohhh. It's that simple? :)
anonymous
  • anonymous
Awesome! Thank you so much! Sorry for my misunderstanding!
anonymous
  • anonymous
Finally. Your welcome :)

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