and how would y = x2 + 4x – 8 look
and y = -3x2 + 1
and y + 6x = x2 + 9
and y = -3x2 + 1
and y + 6x = x2 + 9
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Look at the number before the "x²".
If it's negative, it'll be a decreasing parabola (∩). If this positive, it'll be a increasing parabola (U).
If it's negative, it'll be a decreasing parabola (∩). If this positive, it'll be a increasing parabola (U).
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y--5x2 is upside down U because it is negative