Question

TÌM x biết 

4x^2_12x=-9

Answer 1

Ta có: 4x² - 12x  + 9 = 0

=> (2x - 3)² = 0

=> 2x - 3 = 0 

=> x = 3/2

                               Vậy x = 3/2

Answer 2

\(4x^2-12x=-9\)

\(\Rightarrow\left(2x\right)^2-2.\left(3x\right)+9=0\)

\(\Rightarrow\left(2x\right)^2-2.\left(3x\right)+3^2=0\)

\(\Rightarrow\left(2x-3\right)^2=0\)

\(\Rightarrow2x-3=0\)

\(\Rightarrow2x=3\)

\(\Rightarrow x=\frac{3}{2}\)