Question

resolva a equacão ײ-4×+4=9

Answer 1

$x^{2} -4x+4=9 \\ x^{2} -4x+4-9=0 \\ x^{2} +x-5x-5=0 \\ x*(x+1)-5(x+1)=0 \\ (x+1)*(x-5)=0 \\ x+1 = 0 \\ x-5=0 \\ \left \{ {{x1=-1} \atop {x2=5}} \right.$