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2) 3(5x - ¹/6)² = ax² + bx + c
3( - + ) = ax² + bx + c
- 5x + = ax² + bx + c
dari persamaan diatas, diketahui a = 75, b = -5, c = .
maka, a + b + 12c = 75 + (-5) + 12( ) = 75 - 5 + 1 = 71