Question 1017055
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A) {{{x^2-4x+9}}} = {{{0}}}.

   Use the quadratic formula 

   {{{x[1,2]}}} = {{{(4 +- sqrt(4^2 - 4*9))/2}}} = {{{(4 +- sqrt(-20))/2}}} = {{{(4 +- 2*sqrt(-5))/2}}} = {{{2 +- sqrt(5)*i}}}.
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Unfortunately, you failed to use parentheses properly, so your writing is ambiguous. 
I read it like this and I am not responsible if it is wrong. The responsible side are you.


B) {{{1/(5x )-1/4x +1/3x}}} = {{{(-17)/60}}}.

   Multiply both sides by (5*4*3*x) = 60x, which is the common denominator. You will get

   12 - 15 + 20 = -17x.

   Now solve it yourself.
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