phathima1234 phathima1234
  • 22-11-2020
  • Mathematics
contestada

Find the length of the shortest side ( rounded to 2DP) if the area of the rectangle is 28m^2

Find the length of the shortest side rounded to 2DP if the area of the rectangle is 28m2 class=

Respuesta :

oscar236
oscar236 oscar236
  • 22-11-2020

Answer:

4.39 to 2DP.

Step-by-step explanation:

x * (x - 2) =  28

x^2 - 2x = 28

Solving by completing the square:

(x - 1)^2 - 1 = 28

(x - 1)^2 = 29

x = +/-√29 + 1

x = 6.38516, -4.38516

x must be positive so it = 6.38516.

The shortest side = x - 2 = 4.385.

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