Question

PLEASE HELP ALGEBRA 2!!!

Answer 1

Answer:

$y=-4x^{2} +7x+6$

Step-by-step explanation:

$y=ax^{2} +bx+c$

Points are (1,9), (2,4), and (4,-30).

$\\9=a+b+c\\4=4a+2b+c\\-30=16a+4b+c$

Subtract the first from the second.

-5 = 3a+b

Subtract 4 times the second from the third.

-34=12a+2b

-14=-2b

b=7

a=-4

c=6