Question

Me ajudem a fazer essa função de zero

a)y=x²-6x+8
b)y=-x²-2x+3

Answer 1

Use baskhara

-b+/- raiz b^2-4*a*c/2*a=>

a) x^2-6x+8

a=1 , b=-6 , c=8

-(-6)+/- raiz (-6)^2-4(1)*(8)/2(1)=>
6+/- raiz 4/2=>
6+/-2/2=>
x1=6+2/2=>4
x2=6-2/2=>2


b)-x^2-2x+3

a=-1 , b=-2 ,c=3

-(-2)+/-raiz (-2)^2-4(-1)(3)/2*(-1)=>
2+/- raiz 16/-2=>
2+/-4/-2=>
x1=2+4/-2=>-3
x2=2-4/-2=>1

Espero ter ajudado