2x2 - 1 = 49
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2 x2 - 1 = 49
2x2 = 49 + 1
2x2 = 50
2x = 50 : 2
2x = 25
x = 25 : 2
x = 12.5
Vậy x = ...
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a) 3x + 27 = 9
=> 3x = 9 - 27
=> 3x = -18
=> x = -18 : 3
=> x = -6
b) 2x + 12 = 3(x - 7)
=> 2x + 12 = 3x - 3 . 7
=> 2x + 12 = 3x - 21
=> 3x - 2x = 21 - 12
=> x = 9
c) 2x . 2 - 1 = 49
=> 2x . 2 = 49 + 1
=> 2x . 2 = 50
=> 2x = 50 : 2
=> 2x = 25
=> x =25 : 2
=> x = 25/2
d) |-9 - x| - 5 = 12
=> |-9 - x| = 12 + 5
=> |-9 - x| = 17
=> \(\orbr{\begin{cases}-9-x=17\\-9-x=-17\end{cases}}\)
=> \(\orbr{\begin{cases}x=-9-17\\x=-9-\left(-17\right)\end{cases}}\)
=> \(\orbr{\begin{cases}x=-26\\x=8\end{cases}}\)
3x + 27 = 9
3x = 9 - 27
3x = - 18
x = - 6
b, 2x + 12 = 3.( x - 7 )
2x + 12 = 3x - 21
2x - 3x = - 21 - 12
- x = - 33
x = 33
c, 2x2 - 1 = 49
=> 2x2 = 49 + 1
=> 2x2 = 50
=> x2 = 50 : 2
=> x2 = 25
=> x = 5 hoặc x = - 5
d, | - 9 - x | - 5 = 12
| - 9 - x | = 12 + 5
| - 9 - x | = 17
=> - 9 - x = 17 hoặc - 9 - x = - 17
=> x = - 26 hoặc x = 8
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a: =>33+x=71-36=35
=>x=2
b: =>(2x+6)=200-64=136
=>2x=130
=>x=65
c: =>x-19=76
=>x=95
e: =>x+9=39
=>x=30
f: =>x-8=20
=>x=28
g: =>2x=5*9+49=45+49=94
=>x=47
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\(a,=\left(x+1\right)^2\\ b,=\left(y-2\right)^2\\ c,=\left(x-3\right)^2\\ d,=\left(a-7\right)^2\\ e,=\left(m-2\right)^2\\ f,=\left(2x-1\right)^2\\ g,=\left(a+5\right)^2\\ h,=\left(z-10^2\right)\\ i,=\left(x+3y\right)^2\\ j,=\left(2x-5b\right)^2\\ k,=\left(a+5\right)^2\\ l,=\left(x^2+1\right)^2\\ m,=\left(y^3-1\right)^2=\left(y-1\right)^2\left(y^2+y+1\right)^2\\ n,=\left(c^5-5\right)^2\\ o,=\left(3x^2+2y\right)^2\\ p,=5m^2n^3\left(5m^2n^3-2\right)\)
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\(\left(2x^2+1\right)\left(4x-3\right)=\left(2x^2+1\right)\left(x-13\right)\)
\(\Leftrightarrow\left(2x^2+1\right)\left(4x-3-x+13\right)=0\)
\(\Leftrightarrow\left(2x^2+1\right)\left(3x+10\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}2x^2+1=0\\3x+10=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x^2=-\dfrac{1}{2}\left(VN\right)\\x=-\dfrac{10}{3}\end{matrix}\right.\)
\(S=\left\{-\dfrac{10}{3}\right\}\)
2x2 - 1 = 49
2x2 = 49 + 1
2x2 = 50
x2 = 50 :2
x2 = 25
x2 = 52
x = 5
-5 bình lên cũng = 25 bạn ạ