Question

Does y=-4+3x^2 open upwards Or downwards

Answer 1

Upwards

Explanation:

The general form of a quadratic is
`y=ax^2+bx+c`

We can tell whether the curve opens upward or downward by the sign of "a"

If

• a is positive, the curve opens upward
• a is negative, the curve opens downward

Reaaranging the given equation:

`y=-4+3x^2\\y=3x^2-4`

Here, we see that a is positive, so the curve opens Upward