Question

Which year is the best prediction for when 1206 people will attend graduate school?

Answer 1

D year 15

Explanation:

Given:

y= 8x^2-40x+6

year is the best prediction for when 1206

Finding value of x for y=1206

8x^2-40x+6= 1206

8x^2-40x+6-1206=0

8x^2-40x-1200=0

Solving the above by quadratic formula:

x=
`\frac{-b\sqrt{b^(2)-4ac } }{2a}`

=
`\frac{40\sqrt{40^(2)-4(8)(-1200) } }{2(8)}`

x= 15 and x= -10

As year can not be negative, hence correct answer is

D: year 15!