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8 September, 01:29

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

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  1. 8 September, 03:06
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    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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