need help in these questions

Question

-4

665

2

+2

the graph of $y = ax^2 + bx + c$ is shown below. Find a*b*c (The distance between the grid lines is one unit.)

2.

The line x=4 is an axis of symmetry of the graph ax^2+bx+c Find a*b*c

3. Find the vertex of the graph of the equation y=-2x^2+8x+15

4. The parabola is graphed below. Find a+b+c . (The grid lines are one unit apart.)

FIRST GRAPH FIRST QUESTION SECOND GRAPH 4TH QUESTION

thx for help in advance

NIbberlat Jul 1, 2020

Guest · Answer 1 · 2020-07-01T06:18:47

1. The equation of the parabola is y = 1/3*x^2 - x + 4/3, so abc = (1/3)(-1)(4/3) = -4/9.

3. y = -2x^2 + 8x + 15

(complete square) y = -2(x - 4)^2 + 47 ==> vertex = (4,47)