math please help

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. (square rt. 5) +(square rt. 25) =

2. If y=x^2 +2x +k passes through the point (1,2), then k =

3. If F(x) = 1 +3x^2, where X cannot be 0, then F(x+2)-F(2)/(x) =

  • math please help -

    1.
    √5 + √25 = √5 + 5

    2.
    sub in the point (1,2)
    2 = 1^2 + 2(1) + k
    solve for k

    3.
    I have a strong feeling that you meant:
    (F(x+2)-F(2))/(x)
    = (1 + 3(x+2)^2 - 25)/x
    = (1 + 3x^2 + 12x + 12 - 13)/x
    = (3x^2 + 12x)/x = 3x + 12 , x ≠ 0

    check my arithmetic

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