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x = -7/2 atau x = 1
2. -2x² + 9x + 5 = 0
(-2x+1)(x-5) = 0
x = 1/2 atau x = 5
3. x² + 4x + 4 = 0
(x+2)² = 0
x = -2
4. x² + 2x - 3 = 0
(x+3)(x-1) = 0
x = -3 atau x = 1
semoga membantu ya :)