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Alexxx [7]
3 years ago
8

When 7 is subtracted from two third of the square of a number it becomes 17 find the number​

Mathematics
1 answer:
Dmitry [639]3 years ago
8 0

Answer:  6 or -6

hello,

Step-by-step explanation:

Let say n the number

\dfrac{2}{3} *n^2-7=17\\\Longrightarrow\ \dfrac{2}{3} *n^2=24\\\Longrightarrow\ n^2=\dfrac{3*24}{2}\\\Longrightarrow\ n^2=36\\\Longrightarrow\ (n-6)(n+6)=0\\\\n=6\ or\ n=-6\\

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