Old side = x
(x + 3)2 = 2x2
x2 + 6x + 9 = 2x2
6x + 9 = x2
x2 - 6x - 9 = 0
x = 7.245
Old area 52.49 sq cm ( new = 10.2452) = 104.96. Near enough!
2a2+2a2 = 4a2
No. You could, for example, have a square and a rhombus with sides twice as large.
2X + 3
There are two possible (and different) answers: 2x + 3y = 12 or 2*(x + 3y)= 12 The first one is (twice a number) increased by (three times another) The second is twice (a number increased by (three times another)).
15
2a2+2a2 = 4a2
The lengths are 6.25 and 12.5 metres.
2(3 + x + x2)
No. You could, for example, have a square and a rhombus with sides twice as large.
Both the side lengths and the perimeter are linear measurements, therefore they are proportional. In other words, twice the side length results in twice the perimeter.
40 + 2n
49+2x
2X + 3
There are two possible (and different) answers: 2x + 3y = 12 or 2*(x + 3y)= 12 The first one is (twice a number) increased by (three times another) The second is twice (a number increased by (three times another)).
6
15
164