Question

calcule o Xv e o Yv da equacao x^2+ 8x-9​

Answer 1

a= 1 b= 8 c= -9

Xv= -b/2a
Xv= -8/2•1
Xv= -8/2
Xv= -4

Yv= -Δ/4a
Δ= b^2 - 4ac
Δ= 8^2 - 4•1•(-9)
Δ= 64 - (-36)
Δ= 64 + 36
Δ= 100

Yv= -100/ 4•1
Yv= -100/4
Yv= -25