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=12x kuadrat + 6xy+ 3x
a. 3x( 4x + 2y + 1) = 12x^2 + 6xy + 3x
b. 2x(7x - 5y - 1) = 14x - 10xy - 2x
c. -2x(x + 2y -5) = - 2x^2 - 4xy + 10x
d. -4x( -3x - 2y + 7) = 12x^2 + 8xy - 28x
6.
a. 3x ( ... x + ..y + ... ) = 6x^2 - 9xy + 12x
3x ( 2x + (-3)y + 4) = 6x^2 = 9xy + 12x
b. ...x(3x + ..y + 2) = 9x^2 -6xy + .. x
3x( 3x + (- 2) y + 2) = 9x^2 - 6xy + 2x
c. ...y ( ..x + 7y - 3) = 9xy - 21y^2 + ...y
- 3y ( - 3x + 7y - 3) = 9xy - 21y^2 + 9y
d. 2y(4x - ...y + 5 ) = .. xy + 10y^2 - ..y
2y( 4x - ( -5)y + 5) = 8 xy + 10y^2 - ( -10) y