Question

-x ² -14x-13=0
Me ajudem.

Answer 1

-x ² -14x-13=0.(-1)
x²+14x+13=0
/\=(14)²-4.1.13
/\=196-52
/\=144

x=-14+-raiz de 144/2.1
x=-14+-12/2
x'=-14+12/2=-2/2=-2
x"=-14-12/2=-26/2=-13