What is the surface area of this cylinder? Use ​ ≈ 3.14 and round your answer to the nearest hundredth.

7 ft
7 ft

square feet

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Quadratic formula is -b+_ √b^2-4ac / 2a

In that equation,

a=1

b=4

c=-5

So put these informations to quadratic formula,

-4+_ √16-4*1*-5 / 2

= -4+_ √16+20 / 2

= -4+_ √36 / 2

= -4+_6 / 2

To calculate this, the answers are

-4+6 / 2 and -4-6 / 2

2 / 2 and -10 / 2

So answers are 1 and -5

1, -5