( 3x + 5 ) mu 2 = 289
( 3x -1) mu 5 = 32
9 x - 1 ) mu 2 = ( 2x - 3 ) mu 2
a. (3x-1)5=32 b. (9x-1)2=(2x-3)2
=>(3x-1)5=23 =>9x-1=2x-3
=>3x-1=2 =>9x-1-2x+3=0
=>3x=3 =>7x+2=0
=>x=1 =>7x=-2
=>x=-2/7
Tìm x, biết :
(3x + 5)^2 = 289
( 3x + 5)2 = 289
( 3x + 5 ) 2 = 289
=> ( 3x + 5 )2 = 172
=> 3x + 5 = 17
3x = 17 - 5
3x = 12
x = 4
Vậy x = 4
\(\left(3x+5\right)^2=\left(17^2\right)=\left(-17\right)^2\)2
\(TH1:\)\(3x+5=17\Rightarrow x=4\)
\(TH2:3x+5=-17\Rightarrow x=\frac{-22}{3}\)
\(\left(3x+5\right)^2=289\)
\(\left(3x+5\right)^2=17^2\)
\(\Rightarrow3x+5=17\)
\(3x=17-5\)
\(3x=12\)
\(x=12:3\)
\(x=4\)
a)(3x+5)2=289
(3x+5)2=289
(3x+5)2=172
3x+5=17
3x=17-5
3x=12
x=12:3
x=4
3x.2+6x.5+52=289
3x.2+30x+25=289
6x+30x =264
x+36 =264
Đến đây tự tìm x nhé
tim x
3x - 4 mu 5 : 4 mu 3= 2
\(3x-4^5:4^3=2\\ \Rightarrow3x-4^2=2\\ \Rightarrow3x=18\\ \Rightarrow x=6\)
3x-4^5:4^3=2
3x-4^2=2
3x-16 =2
3x =16+2
3x=18
x =18:3
x=6
a) \3x=9\=\4-x\+0
b)(x-5)16 =(x-5)12
c)(2x-5)(5-x mu 2)(x mu 2 +1=0
d)5 mu x + 5 mu x+2 =650
a, 5x - 10 . ( - 7 ) = 15 .( - 3 )
b, 2x + 12 = - 8
c, 3x - 5 = - 20
d, 2x - ( - 12 ) = ( - 8 ) . 23
e, x mu 2 = 49
i, ( x - 2 ) mu 2 + 1 = 65
g , 2. ( x - 3 ) mu 2 - 5 = 5 . ( - 3 ) mu 2
Tìm x
a, 5x - 10 . (-7) = 15 . (-3)
5x + 70 = -45
5x = -45 - 70
5x = -115
x = -115 : 5
x = -23
Vậy x = -23.
b, 2x + 12 = -8
2x = -8 - 12
2x = -20
x = -20 : 2
x = -10
Vậy x = -10.
c, 3x - 5 = -20
3x = -20 + 5
3x = -15
x = -15 : 3
x = -5
Vậy x = -5.
d, 2x - (-12) = -8 . 23
2x + 12 = -184
2x = -184 - 12
2x = -196
x = -196 : 2
x = -98
Vậy x = -98.
e, x2 = 49
x2 = 72 = (-7)2
=> x = 7 hoặc x = -7.
Vậy x thuộc {-7 ; 7}
i, (x - 2)2 + 1 = 65
(x - 2)2 = 65 - 1
(x - 2)2 = 64
(x - 2)2 = 82 = (-8)2
=> x - 2 = 8 hoặc x - 2 = -8
=> x = 10 hoăc x = -6
Vậy x thuộc {-6 ; 10}.
g, 2 (x - 3)2 - 5 = 5 . (-3)2
2 (x - 3)2 - 5 = 5 . 9
2 (x - 3)2 - 5 = 45
2 (x - 3)2 = 45 + 5
2 (x - 3)2 = 50
(x - 3)2 = 50 : 2
(x - 3)2 = 25
(x - 3)2 = 52 = (-5)2
=> x - 3 = 5 hoặc x - 3 = -5
=> x = 8 hoặc x = -2
Vậy x thuộc {-2 ; 8}.
a) 5x - 10.(-7)=15.(-3) b) 2x+12=-8 c) 3x-5=-20 d)2x-(-12)=-8.23 e)\(^{x^2}\)=49 i)\(\left(x-2\right)^2+1\)=65
5x+70=-45 2x=-8-12 3x=-20+5 2x+12=-184 x=7 \(\left(x-2\right)^2\) =64
5x=-45-70 2x=-20 3x=-15 2x=-184-12 X-2 =8
5x=-115 x=-20:2 x=-15:3 2x=-186 x =10
x=-23 x=-10 x=-5 x=-93
g)\(2.\left(x-3\right)^2-5=5.\left(-3\right)^2\)
\(2\left(x-3\right)^2-5=30\)
\(2.\left(x-3\right)^2=35\)
\(2.\left(x^2-2x.3+3^2\right)=35\)
\(2x^2-24x+18=35\)
\(2x^2-24x=17\)
\(2x\left(x-12\right)=17\)
\(\orbr{\begin{cases}2x=17\\x-12=17\end{cases}}\orbr{\begin{cases}x=\frac{17}{2}\\x=29\end{cases}}\)
Xtim cac gia tri cua x de bieu thuc sau nhan gia tri am
a)x mu 2 + 5x b)x mu 2 - 5/2x c)3(2x+3)(3x-5) d)x - 2/x-6 e) x mu 2 -1/x mu 2
Tìm x biet.
a)x mu 2 -5=0
b)(2x-1)mu 2-(3x+1)mu 2=0
c)4 phần 9×x mũ 2=-4x-9
a) \(x^2-5=0\)
\(\Leftrightarrow x^2=5\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=5\\x=-5\end{array}\right.\)
b) \(\left(2x-1\right)^2-\left(3x+1\right)^2=0\)
\(\Leftrightarrow\left(2x-1+3x+1\right)\left(2x-1-3x-1\right)=0\)
\(\Leftrightarrow5x\left(-x-2\right)=0\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\-x-2=0\end{array}\right.\)\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=-2\end{array}\right.\)
c) \(\frac{4}{9}\cdot x^2=-4x-9\)
\(\Leftrightarrow\left(\frac{2}{3}x\right)^2+4x+9=0\)
\(\Leftrightarrow\left(\frac{2}{3}x+3\right)^2=0\)
\(\Leftrightarrow\)\(\frac{2}{3}x+3=0\Leftrightarrow x=-\frac{9}{2}\)