Writing an equation for a parabola using the x-intercepts:
x=-1 x=4
f(x)=(x+1)(x-4) distribute
f(x)=x^2-4x+1x-4 combine like terms
x^2-3x+4
my question is, why does the -4 turn into a +4 in the final answer?

Need match the functions with correct transformation. f(x) = -3x f(x) = |x-1|+3 f(x) = √(x+3) 1/2x² f(x) = (x+1)²-3 4|x| 1. compress by a factor of 1/2 2. stretch by a factor of 4 3. shift to the left 3 4. shift to the left 1 5. shift up 3 6. reflection