Question

whats x ? 15=5^(x+3) -7

Answer 1

please helppp n_n urgent

Answer 2

how do i start

Answer 3

i added 7 to both sides already

Answer 4

then i am stuck

Answer 5

\[\large{15 = 5^{x+3} - 7}\]

\[\large{15+7 = 5^{x+3}}\]

\[\large{22 = 5^{x+3}}\]

Now, try taking log on both sides.

Answer 6

log22=log5^x+3

ln22=x+3ln5

x=ln22/ln5 ????

@vishweshshrimali5

Answer 7

No

Answer 8

You were right till this step:

\[\large{\ln22 = (x+3)\ln{5}}\]
\[\large{\cfrac{\ln22}{\ln{5}} = x+3}\]

Answer 9

ohhhh subtract three both sides ??

Answer 10

Yeah

Answer 11

sooo x=ln22/ln5 -3

Answer 12

good

Answer 13

yes

Answer 14

thankkkk you @vishweshshrimali5

Answer 15

No problem.