Complete the following tasks for this equation: b/7.8 = -2.15. A. Give an estimate for the solution. Be sure to explain how you arrived at the estimate, either by showing an equation or in words. B. Solve the equation. Show or explain your work. C. Compared to your estimate, is your answer reasonable? Explain your answer in complete sentences.

A) ≅ -16. Rounding the numbers to their closest decimal and multiplicating them.

B) b= -16.77

b/7.8 = -2.15

b= -2.15*7.8

b= -16.77

Step-by-step explanation:

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this