SOLUTION: Please help with a question on a parabola. The parabola in the image has an equation of the form {{{ y = ax^2 + bx - 4 }}}. What is the the equation of the parabola, and what

Question 1053671: Please help with a question on a parabola.
The parabola in the image has an equation of the form .
What is the the equation of the parabola, and what method did you use to find it?
Parabola image: https://s11.postimg.org/kyn0qfe03/para.png

Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
The graph gives five points but the symmetry axis and vertex are not clear, so too difficult to read graphically. Your given equation form has two unknown constants, a and b. You can choose any two points from the graph, but NOT both zeros at the same time.

NOTE: I am picking points from the graph and looking for resulting useful equations to help solve for a and b:

, that point gives us nothing.

-----may be useful

----------useful and now should be enough

SOLVE THIS SYSTEM:

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