anonymous
  • anonymous
12x+9=-4x^2 The discriminant is: a. 288 b. 108 c. -132 d. 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
b. 108
anonymous
  • anonymous
Thanks! How'd you get the answer?
anonymous
  • anonymous
no it will be 0

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anonymous
  • anonymous
Oh o.k. Can you please explain? I have no clue how to solve :/
anonymous
  • anonymous
Kreshnik were you typing? Nothing showed up :/
anonymous
  • anonymous
\[\Large 12x+9=-4x^2\] \[\Large 4x^2+12x+9=0\] now here you got the quadratic equation... use the formula.. \[\Large x_{1/2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\] substitute a=4 b=12 c=9 and you'll get... \[\Large \Delta =b^2-4ac\] \[\Large \Delta =144-4\cdot 4 \cdot 9\] \[\Large \Delta =144-144\] \[\Large \ \Delta =0\] so when Delta =0 we have only one solution... and going on with the formula the solution will be \[\Large x=-\frac32 \quad \quad or \quad \quad x=-1.5\] NONE OF THE MULTIPLE CHOICES ... @Rohangrr Stop giving blindly answers !
anonymous
  • anonymous
Whoa thanks Kreshnik! Awesome explanation
anonymous
  • anonymous
@mathsux4real Glad to help. :) ... You're welcome ;)

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