i am being asked to find the left-most and right-most intercept of f(x) = x2 + 2x – 15

Answer 1

Let x^2 + 2x -15  =  0

x^2 - 3x + 5x - 15  =  0

x(x - 3) + 5(x - 3)  =  0

(x - 3)(x + 5)  =  0

(x - 3)  =  0     ;      (x + 5)  =  0

x  =  3            ;      x  =  -5

Answer :

Hence Left Most Intercept is -5 and Right Most Intercept is 3.