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19-12-2016
Mathematics

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What is the value of 7x to the second power plus 2x when x equals 3?

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19-12-2016

You'd start with the equation (7x)^2+2x
Then x=3 so you'd plug in the 3
(7(3))^2+2(3)
Multiply and get
21^2+6
Then solve 21 to the second which leaves you with: 441+6
441+6=447
The answer is 447

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