The graph represents the relation y = xo2 - 3x - 3. Find the value of x for which x2 - 3x = 7

The graph represents the relation y = xo2 - 3x - 3. Find the value of x for which x2 - 3x = 7

A.

-1.55, 4.44

B.

1.55, -4.55

C.

-1.55, -4.55

D.

1.55, 4.55

Correct answer is A

x2 - 3x = 7

x2 - 3x - 7 = 0

What can you add to both sides of the equation to give the same value of y = x2 - 3x - 3

The number is 4

x2 - 3x - 7 + 4 = 4

x2 - 3x - 3 = 4

but y = x2 - 3x - 3

y = 4; So are y = 4 draw a line parallel to x axis, to cut or intersect the graph. At these points look down to see the corresponding values on x axis

This give -1.55 and 4.55