Question

x2-4x-5=0 me ajudem pfvr?

Answer 1

x²-4x-5=0, basta fazer bhaskara. X= -b±√b²-4.a.c/2
x= -(-4)±√(-4²)-4.1.(-5)/2
x= 4±√16+20/2
x'= 4+6/2= 5
x"= 4-6/2= 1