Question

tìm số nguyễn biết :

3x+12=3(x-7)

2x^2-1=49

giúp mình với

 

Answer 1

2x^2-1=49

->2x^2=50

->x^2=25=>x=5

Answer 2

\(3x+12=3\left(x-7\right)\)

\(\Leftrightarrow3x+3.4=3\left(x-7\right)\)

\(\Leftrightarrow3\left(x+4\right)=3\left(x-7\right)\)

\(\Leftrightarrow x+4=x-7\)( vô lí )

\(\Rightarrow x\in\left\{\varnothing\right\}\)

\(2x^2-1=49\)

\(\Leftrightarrow2x^2=49+1\)

\(\Leftrightarrow2x^2=50\)

\(\Leftrightarrow x^2=50\div2\)

\(\Leftrightarrow x^2=25\)

\(\Leftrightarrow\sqrt{x^2}=\sqrt{25}\)

\(\Leftrightarrow x=5\)