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- 3 = a - 2 + 1 + 5 - 10
- 3 = a - 6
a = 3
a - 1 = 3 - 1
= 2
y =ax^4 -2x^3 +x^2 +5x -10
-3 = a(1) -2 +1 +5 -10
-3=a -6
a=3
maka a-1= 3-1=2