What is the surface area of a cylinder with a diameter of 2 and a height of 12

note: answer must not be fraction or decimal

surface area = 2 x pi x r x h + 2 x pi x r^2

2 x (3.14) x 1 x 12 = 75.36

2 x (3.14) x 1^2 = 6.28

75.36+6.28 = 81.64

 if you cant use a fraction or decimal, does the answer need to be in terms of pi?

that would be 2 x PI x r x h = 2 x pi x 1 x 12 = 24PI

2 x PI x r^1 = 2 x PI x 1 = 2PI

24 PI x 2 PI = 26 PI

step-by-step explanation:

equation

you are asked to write the equation

  expression = 0

using the given expression. when you do that, you have

  2x^2-2x-12 = 0

factoring

you can see that each of the coefficients is even, so a factor of 2 can be removed immediately.

  2(x^2 -x -6) = 0

if you multiply the binomials (x+a)(x+b), you get

  (x +a)(x +b) = x^2 +(a+b)x +ab

this tells you the coefficient of x is the sum of two factors of the constant term. here, that means -1 is the sum of two factors of -6. we want to know those factors so we can factor the trinomial.

  -6 = -1×6 = -2×3 = -3×2 = -6×1

the factor pair that sums to -1 is {-3, 2}, so our factorization is

  2(x -3)(x +2) = 0

solutions

the solutions to this equation are the values of x that make the product zero. a product is zero only when only of the factors of the product is zero. here, that means

  x - 3 = 0

  x = 3 . . . add 3 to both sides of the equation

or

  x +2 = 0

  x = -2 . . . add -2 to both sides of the equation

the solutions to the equation are x=3 or x=-2. both of these values of x satisfy the equation—they make it be true.

step-by-step explanation: