Question

Rewrite the equation in vertex form. Name the vertex and y-intercept.

y = x^2 – 10x + 15


y = (x – 10)^2 –10
vertex: (–10, –10)
y-intercept: (0, –10)

y = (x – 5)^2 – 10
vertex: (5, –10)
y-intercept: (0, 15)

y = (x – 5)^2 + 40
vertex: (5, –10)
y-intercept: (0, 15)

y = (x – 10)^2 + 20
vertex: (–10, –10)
y-intercept: (0, –10)

Answer 1

y = x² - 10 x + 15 =
= (x² - 10 x + 25) - 25 +15=
= ( x - 5 )² - 10
Answer: B) y = ( x - 5 )²-10
vertex: (5, -10)
y - intercept: ( 0,15)