Question

qual a resposta?
2x²-5x-3=0​

Answer 1

Resposta:

2x²-5x-3=0

x'=[5+√(25+24)]/4 = (5+7)/4=3

x''=[5-√(25+24)]/4 = (5-7)/4=-2/4=-1/2

Answer 2

$\boxed{\mathsf{\Delta=b^2-4ac}}$

25 -4 * 2 * -3

25 +24

49

$49|7\\7|7$

49 = 7²

$\boxed{\mathsf{x=\frac{-b\pm\sqrt{\Delta}}{2a}}}}$

5 ± 7/4

x' = (5 +7)/4 = 12/4 = 3

x'' = (5 -7)/4 = -2/4 = -1/2