Question

Rezolvati in  R ecuatia  $x^{2}$ -7x=8

Answer 1

x^2-7x-8=0
a=1
b=-7
c=-8

Delta=b^2-4ac
delta=49-4*1*(-8)
delta=49-32
delta=17

x1=-b- radical din delta/2a
x1=7-radical din 17/2

x2=-b+radical din delta/2a
x2=7+ radical din 17/2

Answer 2

x²-7x-8=0
Δ=b²-4ac
Δ=49-32=81
$x1= \frac{-b+ \sqrt{delta} }{2}  x2= \frac{-b- \sqrt{delta} }{2}$
[tex]x1= \frac{7+9}{2} =8 x2= \frac{7-9}{2} =-1[/tex]