Question

25-25x^2=0 vậy x bằng bao nhiêu

 

 

Answer 1

25(x²-1)=0

x²-1=0:25

x²-1=0

x²=1

x=\(\sqrt{1}\)

Answer 2

25-25x²=0

⇔25(1-x²)=0

⇔25(1-x)(1+x)=0

⇔1-x=0 hay 1+x=0

⇔x=1 hay x=-1

Answer 3

25X²=25

X²=25:25

X²=1

X=1 hoặc x=-1

Answer 4

\(\Rightarrow5^2-\left(5x\right)^2=0\)

\(\Leftrightarrow\left(5-5x\right)\left(5+5x\right)\)

\(\Leftrightarrow\left[{}\begin{matrix}5-5x=0\\5+5x=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}5x=5\\5x=-5\end{matrix}\right.\)

Vậy x = 1 hoặc x = -1

Answer 5

25 - 25x^2 = 0

25 . 1 - 25 . x^2 = 0

25 ( 1^2 - x^2 ) = 0

25 ( 1 + x ) ( 1 - x ) = 0

( 1 + x ) ( 1 - x ) = 25 : 0

( 1 + x ) ( 1 - x ) = 0

⇔ x = 0 - 1 hoặc x = 1 - 0

⇔ x = - 1 hoặc x = 1

Vậy x ∈ { 1 ; - 1 }