Question

Find the x-intercept of y = 4^x - 64.

Answer 1

X intercept is when y=0 and x equal some value.

0=4^x-64
64=4^x ----I added 64 to both sides


This is pretty straight forward from what I left off. Solve for x

Answer 2

make y=0 and solve out for x

Answer 3

but look.
a) (3,0)
b) (64,0)
c) (0.602,0)
d) (1.806,0)

Answer 4

y = 4^x - 64

Set y as 0 and solve for x

\[0 = 4^x - 64\]\[64 = 4^x\]\[\log_{4}64 = 3\]\[x=3\]

Answer 5

Stop being lazy and solve for x stop trying to look at the answers first.

Answer 6

... i just dont get it.

Answer 7

You know how to solve 2x=1 for x?

Answer 8

1/2

Answer 9

you did that by diving 2 to both sides and isolating x.

You are doing the same thing in this case.

64= 4^x

Answer 10

You want x by itself and you do this by ln both sides.

Answer 11

but look at my answers. how is any of those answers get in that form?