Question

4x² -5x = 0 sendo x= √10

Answer 1

$4x^{2}$ - 5x = 0
Δ = $-5 ^{2}$ - 4 · 4 · 1 
Δ = 25 - 16
Δ = 9

$\frac{5 +- 3}{2}$ = 0
X' = 7
X'' = -2

X' = 7 · √10
X' = 7√10

X'' = -2 · √10
X'' = -2√10