a/\(2\cdot x^2-3=29\)
\(2\cdot x^2=29+3=32\)
\(x^2=\frac{32}{2}=16\)
=> \(x=\sqrt{16}=4\)
b/\(\left(-6\right)x-\left(-7\right)=25\)
\(\left(-6\right)x+7=25\)
\(\left(-6\right)x=25-7=18\)
\(x=\frac{18}{-6}=-3\)
c/ \(46-\left(x-11\right)=-48\)
\(46-x+11=-48\)
\(x=46-\left[\left(-48\right)-11\right]=105\)
a) 2x^2 -3= 29
2x^2 = 32
x^2 = 16
x = +4 ; -4
b) -6x - (-7) =25
-6x +7 =25
-6x = 18
x = -3
c) 46 - (x-11) = -48
46 -x +11 = -48
46 -x = -59
x = 105
a/\(2x^2-3=29\)
\(2x^2=29+3=32\)
\(x^2=\frac{32}{2}=16\)
\(x=\sqrt{16}=4\)
b/\(\left(-6\right)x-\left(-7\right)=25\)
\(\left(-6\right)x+7=25\)
\(\left(-6\right)x=25-7=18\)
\(x=\frac{18}{-6}=-3\)
c/\(46-\left(x-11\right)=-48\)
\(46-x+11=-48\)
\(x=46-\left[\left(-48\right)-11\right]=105\)
thieu cau a roi VICTOR_Huỳnh Châu Giang
Bổ sung câu a nghen!
\(x\in\left\{-4;4\right\}\)