Question

encontre o valor dex : (x+3)x=4×10​

Answer 1

Resposta:

x² + 3x = 40

x² + 3x - 40= 0

b² - 4.a.c = Delta

delta= 9 - 4. 1.( -40)

delta= 169

- b+- raiz de delta/ 2a

x'= -3 + 13/2 → 5

x"= -3 - 13/2 → -8