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Artemon [7]
3 years ago
15

A number is multipled by its double and the answer is 72. What is the number ?

Mathematics
2 answers:
AleksAgata [21]3 years ago
5 0

x  \times 2x = 72 \\ 2x^{2}   = 72 \\  \frac{2x^{2} }{2}  =  \frac{72}{2}  \\  {x}^{2}  = 36 \\  \sqrt{ {x}^{2} }  = 36 \\ x = 6
Katena32 [7]3 years ago
3 0
Let x be the number

Then,
x(2x) = 72
2x^2 = 72
x^2 = 36
x = ±√36
x = ±6

The number could be 6 and -6.
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