If -2 is a root of the quadratic equation x²-5x+c find the value of c

Step-by-step explanation:

Given:

A quadratic equation: , with is a solution.

Solve for:

Value of c

Step 1: define the problem

If is a solution of equation , then

Step 2: Perform the calculation

Substitute into original quadratic equation, we have:

Perform the square and multiplication:

Transfer all of numbers to the right side, except c:

(notice for the change in sign of numbers)

Perform the sum on the right side to get c:

Hope this helps!

:)

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you