Answered

IDNStudy.com, kung saan ang iyong mga tanong ay natutugunan ng mabilis na sagot. Hanapin ang impormasyon na kailangan mo nang mabilis at madali sa pamamagitan ng aming komprehensibo at eksaktong platform ng tanong at sagot.

The area of a rectangular room is 65m2. Find the perimeter of the room given that its length is 3m more than thrice its width.
Using quadratic equation

Sagot :

Mlcparra16idn
Length = 3w + 3, width = w

The area of a rectangle is length * width so:
65 = (3w+3)w
65 = 3w² + 3w
0 = 3w² + 3w - 65
We use the quadratic formula
w = -3 ± √[3²+4(3)(65)] = -3 ± √[9+780] = -3 ± √789
                   6                         6                  6
We only get the positive value.

Perimeter = 2(length + width)
Length = 3 (-3 + √789) + 3 = -3 + √789 + 3 = 3 + √789
                        6                      2                      2

Perimeter = 2 (  3 + √789 + -3 + √789 ) = 2 ( 9 + 3√789 -3 + √789 )
                              2              6                              6
= 6 + 4√789   m
          3