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4x - 8y + 4x - 6y = 8x - 14y
2. ( 3x + 5y ) ( 5x - 2y )
=15x^2 - 6xy + 25xy - 10y^2
=15x^2 - 19xy - 10y^2
3. ( 4 x 1 ) ( 4 x 1)
= 4 x 4 = 16
4. x^2 + 7x - 30
Jika p + q = 7
Jika p . q = - 30
maka p = 10 dan q = -3
( x + p ) ( x + q ) >>> (x + 10) (x - 3)