ryankan22 ryankan22
  • 22-02-2021
  • Mathematics
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Given a quadratic equation, how can you determine whether the parabola opens up or down?

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joy123333
joy123333 joy123333
  • 22-02-2021
Answer:
By whether x^2 has a negative or positive coefficient.

If the parabola opens down, x^2 has a negative sign in front of it.

If the parabola opens up, x^2 does not have a negative.

Explanation:
Completely expand a quadratic equation into this polynomial form to find “a”:
ax^2 + bx + c

When “a” is positive, the parabola opens up.

When “a” is negative, the parabola opens down.
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