what is the quadratic function that passes through (-7,0) (4,0) (0,84)

Answer 1

f(x) = a(x+7)(x-4)

= a(x^2 +3x - 28)

a= -84/28= -3

f(x)= (-3)(x^2 +3x -28)

y = -3x^2 -9x +84

goes through the points (-7,0), (4,0) and (0,84)