A = 2b so what is the value of b-a=?
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a=2b

b-a=x

ax=2b²

x=2b²/a

therefore, b-a=2b²/a

-b

Step-by-step explanation:

b-a

=b-2b   [a=2b]

=-b

note: This is what I think the answer might be but it looks too easy to be correct so i might be wrong:(

560

hope this : )

x =-.20752

step-by-step explanation:

4^(x+2)=12

4^(x+2)=12

take the log base 4 on each side

log 4 (4^(x+2) = log 4(12)

we know log b(a^y) = y log b (a)

(x+2) log 4(4) = log 4 (12)

x+2 = log 4 (12)

we know   logb c = loga c/loga b

we want to convert to base 10   so a = 10

by default, we do not write the 10   c = 4   and b = 10

log4 10 = log 12/log 4

log4 10 = log 12/ log 4

x+2 = log 12/ log 4

subtract 2 from each side

x +2 -2 = log 12/ log 4 -2

x = 1.79248125 -2

x =-.20752