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✔OLÁ!!!
A) f(x) = 10x² - 11x + 1
∆ = B² - 4 a.c
∆ = (- 11)² - 4 . 10 . 1
∆ = 121 - 40
∆ = 81
Xv = - b/2.a
Xv = - (- 11) / 2.10
Xv = 11/20
Xv = 0,55
Yv = - ∆ /4.a
Yv = - (+ 81) /4.10
Yv = - 81/40
Yv = - 2,025
B) f(x) = - 4x² + 20x - 25
∆ = B² - 4 a.c
∆ = 20² - 4 . (- 4) . (- 25)
∆ = 400 - 400
∆ = 0
Xv = - b/2.a
Xv = - (+20)/2.(-4)
Xv = - 20/-8
Xv = 2,5
Yv = - ∆ /4.a
Yv = - 0/4.(-4)
Yv = - 0/-16
Yv = 0
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