1) a2 +4b a= -1 b= +2 a) (-1)2 + (4) (2) b) (+2)2 + (4) (-1) 2) a2 +3ab a= -1 b= +2 a) (+2)2 +3 (+2) (-1) b) (-1)2 +3 (-1) (+2) 3) -2x +y x= -2 y= 2 a) -1 b) -2 c) +2 d) +6 4) 5ab + 1 a= 2 b= -3 a) +20 b) -20 c) +29 d) -29 5) x - 2xy  x= -2 y= -1 a) +5 b) -5 c) -6 d) +6 6) a2 +3ab a= -1 b= +2 a) +4 b) -5 c) +5 d) -4

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