mmh
posted by lali on .
wats xsquared13x+36=0

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sqroot(0)=0
you must find where is:
13x+36=0
13x=36 Divide with 13
x=(36)/(13)
x=36/13 
I have no idea what Anonymous did. That answer makes no sense.
x^213x+36 is the same as:
(x4)(x9)
Any number multiplied by 0 is 0. For example:
100 x 0 = 0
8 x 0 = 0
63655215777999400525 x 0 = 0
So if x4 equals 0 OR x9 equals zero, then we know that x4 times x9 equals zero.
x4 = 0. In that case, x=4. (44 is zero)
x9 = 0. So in that case, x=9. (99 = 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.