Question

resolva a equaçao do 2 grau
l)4x ao quadrado +9=12x

Answer 1

E so jogar na formula

Answer 2

$4 x^{2} +9=12x \\ \\ 4x^2-12x+9=0 \\ \\ a=4 \\ b=-12 \\ c=9 \\ \\ \Delta=b^2-4ac \\ \Delta=(-12)^2-4(4)(9) \\ \Delta=144-144 \\\Delta=0 \\ \\ x= \frac{-b\pm \sqrt{\Delta} }{2a} = \frac{-(-12)\pm \sqrt{0} }{8} = \frac{12}{8} = \frac{3}{2} \\ \\ x'=x"= \frac{3}{2}$