Question

The vertex of the parabola below is at the point (1, 5), and the point (2, 8) is on the parabola. What is the equation of the parabola? A. y = 2(x – 1)2 + 5 B. y = 3(x + 1)2 + 5 C. y = 3(x – 1)2 + 5 D. y = 2(x + 1)2 + 5

Answer 1

Answer: B

Explanation:

the parabola having (1,5) as vertex have as equation:

y=k*(x-1)²+5

It is passing through (2,8)

8=k*(2-1)²+5 ==> k+5=8 ==> k=3

equation is y=3(x-1)²+5

Answer B