JA1
  • JA1
Such an easy question, just need to know if I am right: Identify which equation is a quadratic equation. y = 3x + 4 y + x2 = (x − 2)(x + 7) y = −4x(x − 4) + 2x y + 3 = (x + 12)(x2 + 2) I chose D.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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JA1
  • JA1
Since it then becomes y = 2x^2 + 12x - 3
mathstudent55
  • mathstudent55
Let's go through the choices. A has no squared term, so it can't be it.
JA1
  • JA1
That and it has to be x^2 format

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mathstudent55
  • mathstudent55
With B, after you multiply the binomials on the right side, the x^2 term will cancel out with the x^2 term on the left, so there is no squared term anymore, so it's not it.
uri
  • uri
C is the example of quadratic equation.
mathstudent55
  • mathstudent55
Let's look at D. On the right side, when you multiply the binomials together, you have x and x^2. They multiply to x^3. That is not quadratic. It's cubic.
JA1
  • JA1
That and it would make 2x and 7x which is wrong
JA1
  • JA1
Ah I see
mathstudent55
  • mathstudent55
Now let's go back to C. -4x * x is quadratic, and there is no x^2 term anywhere that will cancel it out. So C is the answer
JA1
  • JA1
Ohhhhh ok I see, I skipped C because it was too long to think out :3
uri
  • uri
lol
JA1
  • JA1
But I see your reasoning thanks

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