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A certain number is subtracted 4 times from twice from square of the number
and the result is 70. Find the number.
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I edited your post in order for to make sense from nonsense.
The edited problem is THIS:
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| A certain number is subtracted 4 times from twice the square |
| of the number and the result is 70. Find the number. |
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Solution
Let n be the (or "a") number under the problem's question.
Then, according to the condition, we have this equation
2n^2 - 4n = 70,
n^2 - 2n - 35 = 0,
(n-7)*(n+5) = 0.
So, there are two roots and two possible answers: the number is either -5 or 7.
Solved.
