Respostas

2013-12-03T16:27:42-02:00
X²-x+4 = (x-a)²+(x+b)
x²-x+4 = x²-2ax+a²+x+b
x²-x+4 = x²-2ax+x+a²+b
x²-x+4 = x² -(2a+1)x+a²+b
2a+1 = 1
2a = 1-1
2a = 0
a = 0

a²+b = 4
0²+b = 4
b = 4

a+b = 0+4 = 4
2 4 2