a, \(5\left(2x+1\right)-2x-1=16\)
\(\Leftrightarrow10x+5-2x-1-16=0\Leftrightarrow8x-12=0\Leftrightarrow x=\frac{3}{2}\)
b, \(4x\left(x+5\right)=3\left(x+5\right)\Leftrightarrow4x\left(x+5\right)-3\left(x+5\right)=0\)
\(\Leftrightarrow\left(4x-3\right)\left(x+5\right)=0\Leftrightarrow x=\frac{3}{4};-5\)
c, \(x\left(x-2\right)=3-6\Leftrightarrow x^2-2x+3=0\)
vô nghiệm
a) 5(2x+1)-2x-1=16
10x + 5 -2x =17
8x = 12
x= 3/2
b) 4x(x+5) = 3(x+5)
4x2+20x=3x+15
4x2-17x-15=0
x=5; x=-3/4
c) x(x-2) = 3-6
x^2 -2x -3 = 0
x=3;x=-1
