Which is a value of x, when 3x2 4 = 40?

Algebra
Tutor: None Selected Time limit: 1 Day

Which is a value of x, when 3x2 + 4 = 40?

Jun 1st, 2015

I assume its 3x^2 +4 = 40

3x^2 = 40 - 4

3x^2 = 36

x^2 = 36/3 =12

x = sqrt (12) and  -sqrt(12)

   = 2sqrt(3) and -2sqrt(3)

Please let me know if you have any questions and best me if you are satisfactory.


Jun 1st, 2015

what are you supposed to do after you put the square root symbol with x and the 12?

Jun 1st, 2015

sqrt (12) = sqrt(4*3)

sqrt (4) = 2

            Taking 4 outside the root, we get sqrt (12) =  2 * sqrt(3)

                                                                               = 2sqrt (3)

Jun 1st, 2015

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