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(2x-6) (x+1) = 0
#2x-6 = 0 #x+1 = 0
2x = 6 x2 = -1
x1 = 3
a. x1² + x2² = 3² + (-1)² = 9 + 1 = 10
b. 1/3 + 1/-1 = 1+(-3) = -2
3 3
c.(2.3)² + (2.-1)² = 36 + 4 = 40
d. 1/9 + 1/1 = 10/9