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algebra

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Need help. please help:
Solve and simplify, use comma to separate answers:

sqrt:9x+55=x+5

  • algebra - ,

    √(9x+55) = x+5
    9x+55 = (x+5)^2 = x^2 + 10x + 25

    x^2 + x - 30 = 0
    (x+6)(x-5) = 0

    x = -6,5

    Check:
    √(-54+55) = √1 = -6+5 = 1
    √(45+55) = √100 = 5+5 = 10

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