Question

Write the equation for the parabola that has x− intercepts (1.2,0) and (4,0) and y− intercept (0,12).

Answer 1

From the 2 x-intecepts we know it must be of the form
y = a(x-1.2)(x-4)
sub in the point (0,12)
12 = a(-1.2)(-4)
a = 2.5

y = 2.5(x - 1.2)(x - 4)

expand and simplify if you feel it necessary

Answer 2

How about a real answer?