Question

Help! Solve for x. 2^x-3=128

Answer 1

Do you know what the first step is?

Answer 2

I don't

Answer 3

well you need to rewrite 128 as a power of 2

\[128 = 2^7\]

so the problem becomes

\[2^{x -3} = 2^7\]

so equate the powers and solve for x

x - 3 = 7

Answer 4

10?

Answer 5

questions of this type, you should re-write them with the same base. The you can equate the powers

Answer 6

that's correct

Answer 7

Awesome! Thank you

Answer 8

@campbell_st could you help me with one more? Or at least get me started? 5^2x-5=125