Question

calculando o valor numerico da expressoes -b+√b²-4ac/2a , para a=1,b=2 e c = -3, obtemos :

Answer 1

a= 1 b=2 c= -3
x²+2x-3=0

$-b + \frac{ \sqrt{b^2-4ac} }{2a}\\ \\ -2 + \frac{ \sqrt{2^2-4.1(-3)} }{2.1} \\ \\ -2 + \frac{ \sqrt{16} }{2} \\ \\ -2 + \frac{4}{2}= 1$