Question

encontre raiz da funçao 2x²-9

Answer 1

2x² - 9

2x² = 9
x² = 9 / 2
x = ± √9/2
x = ± √9 / √2
x = ± √9 .√2 / √2.√2
x = ± √18 / (√2)²
x = ± 3√2 / 2

x' = 3√2 / 2 

x'' = -3√2 / 2

S = { 3√2 / 2 ,  -3√2/2 }