Question

(×+1)ao quadrado+3×=0​

Answer 1

(x + 1)² + 3x = 0

(x + 1) • (x + 1) + 3x = 0

x² + x + x + 1 + 3x = 0

x² + 2x + 3x + 1 = 0

x² + 5x + 1 = 0

A= 1

B= 5

C= 1

∆= b² - 4ac

∆= 5² - 4 • 1 • 1

∆= 25 - 4

∆= 21

x= - b ± √∆ / 2a

x= - 5 ± √21 / 2 • 1

x'= - 5 + √21/2

x''= - 5 - √21/2