Question

(3x+4)mũ 3 +125=0

Answer 1

\(\Rightarrow\left(3x+4\right)^3=-125=\left(-5\right)^3\\ \Rightarrow3x+4=-5\\ \Rightarrow3x=-9\\ \Rightarrow x=-3\)

Answer 2

(3x+4)\(^3\)+125=0

⇒(3x+4)\(^3\)=-125

⇒(3x+4)\(^3\)=-(5\(^3\))

⇒3x+4=-5

⇒3x=-9

⇒x=-3

Answer 3

( 3x+4 )^3 +125=0

( 3x+4 )^3=0-125

( 3x+4)^3=-125

( 3x+4)^3=-5^3

3x+4 = -5

3x  = -5 - 4

3x  = -9

x     = -9 : 3

x    = -3