Question

me ajudem por favor

Answer 1

x²+3x-4x=0
∆= b²-4ac
= (3)²-4(1)(-4)
= 9 + 16
∆= 25

X=-b±√∆/2a
X= -(3)±√25/2(1)
X= -3±5/2

X¹= -3+5/2
= 2/2
= 1

X²= -3-5/2
= -8/2
= -4

S= {-4,1}