Question

equação do 2°grau quanto e x²+3=4x???

Answer 1

$x^{2} +3=4x\to\\ \\ x^{2} -4x+3=0\\\\ a=1;b=-4;c=3\\\\\\ \Delta=b^2-4ac\to \Delta=(-4)^2-4*1*3\to \Delta=16-12\to \Delta=4\\\\ x' \neq x''\\\\ x= \frac{-b\pm \sqrt{\Delta} }{2a} \to x= \frac{-(-4)\pm \sqrt{4} }{2*1a} \to x= \frac{4\pm 2}{2} \to\\\\\\ x'= \frac{4+ 2}{2} \to x'= \frac{6}{2} \to x'=3\\\\\\ x''= \frac{4-2}{2} \to x''= \frac{ 2}{2} \to x''=1\\\\\\\\ S=\left \{ 1;3 \left \}$