Solve the equation? Please help solve?

√(x+7+5)=x

6 Answers

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  • mizoo
    Lv 7
    7 years ago
    Best Answer

    √(x + 12) = x ..... we know x ≥ 0

    x + 12 = x^2

    x^2 - x - 12 = 0

    (x - 4)(x + 3) = 0

    x = -3, 4

    Since -3 is not in the domain

    ==> x = 4

  • 7 years ago

    √(x+7+5)=x square both sides

    x+7+5=x^2 set up in quadratic equation format

    x^2 -x -12 = 0 factor tow numbers, where their SUM is -1 and their PRODUCT is -12

    (x-4)(x+3) = 0 two solutions

    x = 4

    or

    x = -3

  • 7 years ago

    Square both sides to get x+7+5=x2

    Put the x's on one side so you get 7+5=X2+x

    So 12= x2-x

    So x=4 because 4 sqaured is 16, 16-4 is 12

  • 7 years ago

    x^2 = x+7+5

    x^2 = 12+x

    if you use logic, from 1 to 9 the only one that can make x^2 = 12 + x is 4. becase if you 4^2 = 12+4 it is the truth. so the answer is 4

    ps. sorry my english is weird

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  • patrik
    Lv 4
    3 years ago

    3t + a million < t + 12 (subtract t from the two factors) 2t + a million < 12 (subtract a million from the two factors) 2t < 11 (divide the two factors with the help of employing 2) t < 11/2 the biggest complete type value of t that satisfies the inequality is 5.

  • 7 years ago

    (0_0)! (U_U) 8-)

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