Use the quadratic formula to solve the equation.
-X^2+ 7x = 5

(7±√29) /2

Step-by-step explanation:

-x²+7x=5

x²-7x+5=0

x=-(-7)/2 ±√49/4-4

 =7/2±√29 /4

 =(7±√29) /2

4 packs of water and 7 packs of candy bars

step-by-step explanation:

35x4=140

140/20=7

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: