A parabola opening up or down has vertex (0, -2) and passes through (8, -18). Write its
1 answer:
Answer:
<u>f(x) = -1/4(x - 0)^2 - 2</u>
Step-by-step explanation:
vertex form:
f(x) = a(x - h)^2 + k
<em>1) put the vertex in the equation, ( (h, k) is the vertex)</em>
f(x) = a(x - 0)^2 - 2
<em>2) plug in the point (8, -18) to find the value of a</em>
-18 = a(8 - 0)^2 - 2
-18 = a(64) - 2
-16 = a(64)
-16/64 = a
-1/4 = a
<em>3) plug in the value of a into the equation</em>
<u>f(x) = -1/4(x - 0)^2 - 2</u>
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