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mmh

posted by on .

wats xsquared-13x+36=0

  • Math - ,

    Please type your subject in the School Subject box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.

  • mmh - ,

    sqroot(0)=0

    you must find where is:

    -13x+36=0

    -13x=-36 Divide with -13

    x=(-36)/(-13)

    x=36/13

  • mmh - the correct answer and spelling of "math." - ,

    I have no idea what Anonymous did. That answer makes no sense.

    x^2-13x+36 is the same as:
    (x-4)(x-9)

    Any number multiplied by 0 is 0. For example:
    100 x 0 = 0
    8 x 0 = 0
    63655215777999400525 x 0 = 0

    So if x-4 equals 0 OR x-9 equals zero, then we know that x-4 times x-9 equals zero.

    x-4 = 0. In that case, x=4. (4-4 is zero)
    x-9 = 0. So in that case, x=9. (9-9 = 0)

    So x is either 4 or 9. Let's check to be sure.

    4:
    x squared is 16
    13x is 52
    36 is...well...36.

    16 -52 + 36 does equal 0. So we are ok there.

    9:
    9 squared is 81
    13 x 9 = 117

    81 - 117 + 36 equals zero.

    9 and 4 are your answers.

    Side note: if writeteacher didn't correct your spelling of "math," I likely would not have seen this question. Be careful next time.

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