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Assoli18 [71]
3 years ago
10

When 8 is subtracted from the square of a number, the result is 7 times the number.

Mathematics
1 answer:
LuckyWell [14K]3 years ago
4 0

Answer:

8

Step-by-step explanation:

x^2 - 8 = 7x

x^2 - 7x - 8=0

(x - 8)(x + 1)=0

x - 8= 0   x + 1=0

x=8           x= -1

8 is the positive solution

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The answer to the first one is:

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 In the equation 8x+10y=-4, you subtract 10y form each side which leaves you with 8x=-10y-4. Right? Then you divide each side by 8 which gives you the answer

The answer to the second one is the same answer to the first problem. Why? Because you can already divide each side which gives you x=-5/4y+-1/2.

Hope this helps :^) 

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