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# Logarithms help? Watch

1. The curve with equation y= 4^-x intersects the curve y= 3 x 4^x at point P. Use logs to find the x-coordinate of P, giving your answer to 3 sig figs.

so obviously I set 4^-x equal to 3 x 4^x, but then what? :s

thanks!
2. (Original post by Martynnnn)
The curve with equation y= 4^-x intersects the curve y= 3 x 4^x at point P. Use logs to find the x-coordinate of P, giving your answer to 3 sig figs.

so obviously I set 4^-x equal to 3 x 4^x, but then what? :s

thanks!
Multiply by and solve the quadratic
3. so what am I using logs for?
4. (Original post by Martynnnn)
so what am I using logs for?
to find x after you have solutions to the quadratic

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