# Thread: Need help with some basics.

1. ## Need help with some basics.

1.) find all real number solutions, by 2 decimal places. 9b^4 = 6

2.) Find the approx equation y = ab^2 of the exponential curve that contains the given pair of points. ( 0, 82 ) , (6, 19)

This is not for homework, just reviewing algebra basics.

2. ## Re: Need help with some basics.

Originally Posted by wolfwood
1.) find all real number solutions, by 2 decimal places. 9b^4 = 6
Divide through by 9 and simplify to get $\displaystyle b^4 = 2/3$. Then take the fourth root of both sides: $\displaystyle (b^4)^{1/4} = b = (2/3)^{1/4}$. Do you have a calculator? Remember that there are both positive and negative values for b.

Originally Posted by wolfwood
2.) Find the approx equation y = ab^2 of the exponential curve that contains the given pair of points. ( 0, 82 ) , (6, 19)
I don't understand - perhaps you meant to write y = ax^2? If so, that equation would go through (0,0), not (0,82). Perhaps you meant an equation of the form y = ax^2 + b?