3(x+5)= -4x+8
How many solutions does this equation have

1 solution, x = -1

Step-by-step explanation:

First distribute the 3 into x +5

3x+15 = -4x+8

Then add 4x to both sides

7x +15=8

Then subtract 15 from both sides

7x = -7

Finally divide by 7 to find x

x = -1

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: