# Need help with some basics.

• Oct 16th 2013, 11:52 AM
wolfwood
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.
• Oct 16th 2013, 01:29 PM
ebaines
Re: Need help with some basics.
Quote:

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.

Quote:

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?