Question

a, 2\(^{4X-8}\)=16

b, [ 2. ( x . 1 ) + 6 . ] \(^5\)=1

c, ( 7 x 14 ) 2 = 49

Answer 1

a) \(2^{4x-8}=16\)

\(2^{4x-8}=2^4\)

`=>4x-8=4`

`4x=12`

`x=12/4`

`x=3`

b) \(\left[2\cdot\left(x\cdot1\right)+6\right]^5=1\)

\(\left(2x+6\right)^5=1\)

\(\left(2x+6\right)^5=1^5\)

\(2x+6=1\)

`2x=1-6`

`2x=-5`

`x=-5:2`

`=>x=-5/2`

c) chưa hiểu đề bài

Answer 2

a)

\(=>2^{4x-8}=2^4\)

\(=>4x-8=4\)

\(4x=12\)

\(x=3\)

b)

\(=>2.\left(x.1\right)+6=1\)

\(2x\left(x.1\right)=-5\)

\(x.1=\dfrac{-5}{2}\)

\(x=\dfrac{-5}{2}\)

c)

\(7x.14=\dfrac{49}{2}\)

\(7x=\dfrac{7}{4}\)

\(x=\dfrac{1}{4}\)