Question

-2x2+10x=10 quanto é ​

Answer 1

-2x^2+10x=10
- 2x^2 + 10x - 10 = 0 (:2)
- x^2 + 5x - 5 = 0 (-1)
x^2 - 5x + 5 = 0
a = 1; b = - 5; c = 5
/\= b^2 - 4ac
/\ = (-5)^2 - 4.1.5
/\ = 25 - 20
/\= 5

x = (- b +/- \/ /\)/2a
x = [-(-5) +/- \/5]/ 2.1
x = (5 +/- \/5)/2

x ' = (5+\/5)/2
x " = ( 5 - \/5)/2