The area of the base of a rectangular desk telephone is 810 square centimeters. The length of the rectangular telephone is 3 centimeters longer than its width.

Question

just need to know how this is all done please and thank you

Answer 1

x(x+3) = 810

x^2 + 3x - 810 = 0

( x + 30 )(x - 27 ) = 0

x+30 = 0 ---> x = -30

x - 27 = 0 --> x = 27

rectangle 27 x 30