Question

2x ao quadrado + 5 = 7x

Answer 1

Resposta:

2x² + 5 = 7x

2x² – 7x + 5 = 0

b² – 4ac

(–7)² – 4•2•5

49 – 40

9

x' = [–(–7) + 3] / 2•2

x' = 7 + 3 / 4

x' = 10/4 = 5/2

x'' = [–(–7) – 3] / 2•2

x'' = 7 – 3 / 4

x'' = 4/4 = 1