Solve by completing the square show work 1)
2)

1. x=5 or -3

Step-by-step explanation:

1. 3x²-6x-45

since all can be divided by 3, u will divide all by three.

the result will be

x²-2x-15=0

x²-5x+3x-15=0

x(x-5)+3(x-5)=0

(x+3)(x-5)= 0

x+3=0 or x-5=0

x=-3 0r 5.

2. 4x²+24x=-35

4x²+24x+35=0

4x²+10x+14x+35=0

2x(2x+5)+7(2x+5)=0

(2x+7)(2x+5)=0

2x+7=0

x=-7/2

2x+5=0

x=-5/2

there fore x=-7/2 or -5/2

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

35-60 students are taking math.