9. Which of the following quadratic functions has a vertex with coordinates (-1, 7)?
Select one:
O A. y = –2(x + 1)2 + 7
B. y = (x – 7)2 + 1
O C. y= 4(x + 7)2 – 1
O D. y = 7(x - 1)2 + 1

15 units use socratic

step-by-step explanation: 15 units

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

it has to have an angle of 90 degrees