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Verified answer
1) (2x + 3)² = 4x² + 18x + 92) x² - 8x - 20 = 0
(x - 10)(x + 2) = 0
x = 10 atau x = - 2
3) 8x + 6y
= 2 ( 4x + 3y )
4) 2y² + y
= y ( 2y + 1 )