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algebra

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f of x = the square root of 2x minus 5
Find f (27)
A. 2
B. 3
C. -5
D. 7
D
not sure on this stuff, could you explain the steps?

  • algebra -

    just substitute in the value for x:

    If f(x) = √(2x-5),
    f(27) = √(2*27 - 5) = √(54-5) = √49 = 7

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