Question

b) 5 mũ 2 + (28-3x)=5 mũ 3

Answer 1

\(5^2+\left(28-3x\right)=5^3\)

\(25+\left(28-3x\right)=125\)

\(\left(28-3x\right)=125-25\)

\(\left(28-3x\right)=100\)

\(3x=28-100\)

\(3x=-72\)

\(x=-72:3\)

\(x=-24\)

Answer 2

5²+(28-3x)=5³

<=>25+(28-3x)=125

=>28-3x=125-25

=>28-3x=100

=>3x=100-28

=>3x=72

=>x=72:3

=>x=24

Answer 3

5² + (28 - 3x) = 5³ 

28 - 3x = 5³ - 5²

28 - 3x = 100

3x = 28 - 100

3x = -72

x = 72 : 3

x = -24