Question

x-2=24

5.(5-x)=-25

3^x-7=2².5

Answer 1

a) x - 2 = 24

x = 24 + 2

x = 26

b) 5.(5 - x) = -25

5 - x = -25 : 5

5 - x = -5

x = 5 - (-5)

x = 5 + 5

x = 10

c) 3^x - 7 = 2².5

3^x - 7 = 4.5

3^x - 7 = 20

3^x = 20 + 7 

3^x = 27

3^x = 3³ (cùng cơ số)

⇒ x = 3

Answer 2

\(x-2=24\)

\(x=24+2\)

\(x=26\)

________

\(5\left(5-x\right)=-25\)

\(5-x=-25:5\)

\(5-x=-5\)

\(x=5+5\)

\(x=10\)

_____

\(3^x-7=2^2.5\)

\(3^x-7=4.5=20\)

\(3^x=20+7\)

\(3^x=27=3^3\)

 \(=>x=3\)