Question

Rezolvati in R ecuatia x² - 5x + 4 =0


Va rogggggg

Answer 1

x² - 5x + 4 =0
d = 25 - 16 = 9 
x1 = 5+3/2 = 8/2 = 4
x2 = 5-3/2 = 2/2 = 1 

x = { 1;4} 

Answer 2

$\displaystyle x^2 - 5x + 4 =0 \\ {\boxed{\Delta = b^2-4ac}} \\ =(-5)^2-4 \cdot 1 \cdot 4 \\ =25- 16 \\ =9 \\ \\ \boxed{X_{1,2}= \frac{-b\pm \sqrt{\Delta} }{2a} } \\ \\ \\X1= \frac{5+3}{2} =4 \\ \\ \\X2= \frac{5-3}{2} =1$