What is 12 x -4 divided by 16

The $x$-intercepts of the parabola $y = x^2 + bx + c$ are $(-3,0)$ and $(5,0).$ find the equation of the parabola, and submit your answer in $y = ax^2 + bx + c$ form.

What number produces an irrational number when multiplied by -1.25

Solve the equation.then check your solution 8=1.88+a