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lana66690 [7]
3 years ago
6

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

Mathematics
1 answer:
Roman55 [17]3 years ago
8 0

Step-by-step 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 \\  \frac{7k}{7}  =  \frac{21}{7}  \\ k = 3

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