Question

x² + 3x - 10 = 0 por favor me ajudem !

Answer 1

Resposta:

$X= \frac{-b±\sqrt{b^{2}-4ac } }{2a} \\x^{2} +3x -10=0\\a= 1\\b=3\\c= -10\\X=\frac{-3±\sqrt{3^{2} -4.1(-10)} }{2 .1} \\\\X=\frac{-3±\sqrt{9-4.1(-10} }{2 .1} \\X= \frac{-3±\sqrt{9+40} }{2 .1} \\x =\frac{-3±\sqrt{49} }{2.1} \\x =\frac{-3±7}{2.1} \\= \frac{-3±7}{2} \\x=\frac{-3+7}{2} \\x= \frac{-3-7}{2} \\x = 2\\x = -5$

Explicação passo-a-passo: