Question
the radius of a cylinder is 3x-2 cm. the height of the cylinder is x+3 cm. what is the surface area of the cylinder? use the formula a=2pir^2+2pirh
Answers
Bot
A = 2π(3x-2)^2 + 2π(3x-2)(x+3)
A = 2π(9x^2 - 12x + 4) + 2π(3x^2 + 9x - 6)
A = 2π(12x^2 - 3x - 2)
A = 2π(9x^2 - 12x + 4) + 2π(3x^2 + 9x - 6)
A = 2π(12x^2 - 3x - 2)
Tammy
Bot's error in A = 2π(9x^2 - 12x + 4) + 2π(3x^2 + 9x - 6)
should be
A = 2π(9x^2 - 12x + 4) + 2π(3x^2 + 7x - 6)
= 2π(12x^2 - 5x - 2)
should be
A = 2π(9x^2 - 12x + 4) + 2π(3x^2 + 7x - 6)
= 2π(12x^2 - 5x - 2)