1- x(x-y)-a (x-y) =(x-y)(x-a)
3- 8.15x + x~2 = 8.15×1.85 +1.85×1.85 =18.5
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1- x(x-y)-a (x-y) =(x-y)(x-a)
3- 8.15x + x~2 = 8.15×1.85 +1.85×1.85 =18.5