College Algebra HELP!!?

  • Thread starter Thread starter Daileen
  • Start date Start date
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Daileen

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Solve the polynomial equation
84x^2-30x=0

Possible answers
a.) { 5/14,30 }
b.) { 5/14 }
c.) { 0 }
d.) { 0 , 5/14 }

It would be great if you would help me and explain please :D
Thanks so much
 
d.

Factor out 6x so:
6x(14x - 5) = 0

Find the two solutions by setting each factor to zero (because when they are multiplied, their product must equal zero, so one of them must equal zero).

IF 6x = 0
x=0/6 = 0.

IF 14x - 5 = 0
14x = 5
x = 5/14

The two solutions are 0, 5/14
 
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