In Exercises 3-12, solve the equation. Check your solution. (See Examples

I

and 2.)\ 3.

4^(5x)=4^(10)

\ 4.

7^(x-4)=7^(8)

\ 5.

3^(9x)=3^(7x+8)

\ 6.

2^(4x)=2^(x+9)

\ 7.

2^(x)=64

\ 8.

3^(x)=243

\ 9.

7^(x-5)=49^(x)

\ 10.

216^(x)=6^(x+10)

\ 11.

64^(2x+4)=16^(5x)

\ 12.

27^(x)=9^(x-2)

In Exercises 3-12, solve the equation. Check your solution. (See Examples I and 2.) 3. 45x=410 4. 7x4=78 5. 39x=37x+8 6. 24x=2x+9 7. 2x=64 8. 3r=243 9. 7x5=49x 10. 216x=6x+10 11. 642x+4=165x 12. 27x=9x2