A triangular number can be the number of dots that form a triangle, where each row has one more dot than the row above. The first four triangular numbers are 1, 3, 6, and 10. The formula t=12n2+12n gives the nth triangular number. You can solve the formula for n by subtracting t from each side so that the equation is in standard form and then using the quadratic formula. What values would you use for a, b, and c? Enter your answers in the boxes. a = , b = , c =

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since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

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