x2 - 3x = 7x2 - 3x - 7 = 0What can you add to both sides of the equation to give the same value of y = x2 - 3x - 3The number is 4x2 - 3x - 7 + 4 = 4x2 - 3x - 3 = 4but y = x2 - 3x - 3y = 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
