1. Day 1 ­ Standard form
y = ax2 + bx + c Standard form of a quadratic
y ­ intercept (0, c)
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2. Axis of symmetry ­ the imaginary line that cuts a parabola in half
x = ­3
Find the axis of symmetry of y = x2 ­ 2x ­ 1.
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3. How can I use the axis of symmetry to find the coordinates of the
vertex of y = x2 ­ 2x ­ 1?
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4. Graph y = 2x2 ­ 8x + 5. Identify the vertex, axis of symmetry, and
y­intercept. State whether the vertex is a maximum or a minimum.
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5. You try:
Graph y = ­2x2 ­12x ­ 7. Identify the vertex, axis of symmetry, and
y­intercept. State whether the vertex is a maximum or a minimum.
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6. The barber's profit p each week depends on his charge c per
haircut. It is modeled by the equation p = ­200c2 + 2400c ­ 4700.
What price should he charge for the largest profit?
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