r2+6r-7 = (r+7)(r-1) when factored
-15
(5r - 4)(5r + 4)
domain = set R ,, all real numbers
The formula for volume is 1/3 Bh ( 1/3 pi times radius squared times the height.) The formula for surface area is 2 pi r h plus 2 pi r squared.
r2-r-56 factored out equals (r-8)(r+7).
r2+r2 = 2r2
I think so.r2 + 7r + 6 = [ (r+6) (r+1) ]
r2+6r-7 = (r+7)(r-1) when factored
It is 22 + R
-15
7(r-12) A 7 is taken out because it is a common factor to both terms.
r=-29
(3r + 2)(r - 5)
(5r - 4)(5r + 4)
domain = set R ,, all real numbers
A = pi R^2 = 400 pi R^2 = 400 R = 20