Question

Tìm x :

a) (3.x-2)³=2.32

b) 5^x+1-5^x=500

Answer 1

a) (3.x - 2)³ = 2.32

=> (3.x - 2)³ = 64 = 4³

=> 3.x - 2 = 4

=> 3.x = 6

=> x = 2.

b) 5^x+1 - 5^x = 500

=>5^x.5 - 5^x = 500

=> 5^x.(5 - 1) = 500

=> 5^x.4 = 500

=> 5^x = 125 = 5³

=> x = 3

Answer 2

\(a,\left(3.x-2\right)^3=2.32\)

\(\Rightarrow\left(3x-2\right)^3=64\)

\(\Rightarrow\left(3x-2\right)^3=4^3\)

\(\Rightarrow3x-2=4\)

\(\Rightarrow3x=4+2=6\)

\(\Rightarrow x=2\)

\(b,5^{x+1}-5^x=500\)

\(\Rightarrow5^x.5-5^x=500\)

\(\Rightarrow5^x\left(5-1\right)=500\)

\(\Rightarrow5^x=500:4=125=5^3\)

\(\Rightarrow x=3\)

Answer 3

a,(3.x-2)³=64

(3.x-2)³=4³

(3.x-2)=4

3.x=4+2

3.x=6

x=6:3=2

Answer 4

a) (3.x - 2)³ = 2.32

=> (3.x - 2)³ = 64 = 4³

=> 3.x - 2 = 4

=> 3.x = 6

=> x = 2.

b) 5^x+1 - 5^x = 500

=>5^x.5 - 5^x = 500

=> 5^x.(5 - 1) = 500

=> 5^x.4 = 500

=> 5^x = 125 = 5³

=> x = 3

Ps thamk haor nha

Answer 5

a,(3.x−2)3=2.32

⇒(3x−2)3=64

⇒(3x−2)3=43

⇒3x−2=4

⇒3x=4+2=6

⇒x=2

b,5x+1−5x=500

⇒5x.5−5x=500

⇒5x(5−1)=500

⇒5x=500:4=125=53

k nha