Determine the coordinates where the graphs of the equations
Determine the coordinates where the graphs of the equations y=x2 and y=6x+(16) intersect.
Solution
y =x^2 ; y = 6x +16
x^2 = 6x +16
x^2 -6x -16
solve the quadratic:
x^2 -8x +2x -16 =0
x(x-8) +2(x -8) =0
(x +2)(x -8) =0
x = -2 , 8
y =x^2
x = -2 ; y = 4
x =8 ; y = 64
Solution : (x , y) = ( -2 , 4) and ( 8 , 64)
