Practice problem
Which of the following parabolas open upward?
y=12x2y = \frac{1}{2}x^2y=21x2
y=−12x2y = -\frac{1}{2}x^2y=−21x2
y=4x2y = 4x^2y=4x2
y=−4x2y = -4x^2y=−4x2
Type a concept, like “slope” or “photosynthesis”.
