5. 9 (2x -1)^2 - 4x(x+1)^2 =0
Giải thích
92x−12−4x+12=0
⇔94x2−4x+1−4x2+2x+1=0⇔32x−12−2x+12=0⇔6x−3+2x+26x−3−2x−2=0⇔4x−58x−1=0⇔4x−5=08x−1=0⇔x=54x=18
S=54;18
92x−12−4x+12=0
⇔94x2−4x+1−4x2+2x+1=0⇔32x−12−2x+12=0⇔6x−3+2x+26x−3−2x−2=0⇔4x−58x−1=0⇔4x−5=08x−1=0⇔x=54x=18
S=54;18