anonymous
  • anonymous
a rectangular garden measures 5m by 7m. both dimensions are to be extended by the same amount so that the area of the garden is doubled . by how much should the dimensions increase, to the nearest tenth of a metre?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
You have 5 * 7= 35 and you want to multiply each side by the same number in order to get double area (70) so (5*a) * (7*a) = 70 where a is the number you want to multiply \[35a^2=70\] \[a^2=2\] \[a=\sqrt{2}\]

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