hello if i having this problem
a closed cylinder 15 cm high has a surface area of 1500 cm squared, find the radius of the cylinder.
To solve this equation could i use the quadratic formula ? or is there another way I can do.
Thank you for any helps
hello if i having this problem
a closed cylinder 15 cm high has a surface area of 1500 cm squared, find the radius of the cylinder.
To solve this equation could i use the quadratic formula ? or is there another way I can do.
Thank you for any helps
See if your final equation is quadratic in the form
Ax^2 +Bx +C = 0
Then, yes, you can use the Quadratic formula to find x.
Closed right circular cylinder 15cm high, 1500sq.cm total surface area, and radius r.
Find r.
1500 = (2pi*r)(15) + 2(pi*r^2)
Umm, yes, you can use the Quadratic formula here.
1500 = 30pi*r +2pi*r^2
2pi*r^2 +30pi*r -1500 = 0
r = {-30pi +,-sqrt[(30pi)^2 -4(2pi)(-1500)]} / 2(2pi)
r = {-94.2478 +,-215.8281} /12.5664
r = 9.675cm or -24.675cm
Reject the r = -24.675cm because there are no negative dimensions.
Therefore, r = 9.675cm ---------------answer.