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(x^2+5)=7 and (x^2+5)k=21, what is the value of k?
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(x^2+5)=7 and (x^2+5)k=21, what is the value of k?

User Itinerati
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1 Answer

3 votes

Explanation:


{x}^(2) + 5 = 7 \\ {x}^(2) = 7 - 5 \\ {x}^(2) = 2 \\ \\( {x}^(2) + 5)k = 21 \\ (2 + 5)k = 21 \\ (7)k = 21 \\ 7k = 21 \\ (7k)/(7) = (21)/(7) \\ k = 3

User Yury Skaletskiy
by
5.2k points
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