solve the quadratic equation (2x+3)(x-4)=6
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(2x^2 - 8x +3x -12)= 6
2x^2 -5x -12 -6 = 0
2x^2 - 5x -18= 0
2x^2 +4x -9x -18= 0
2x( x+2) -9( x+2)= 0
( 2x -9)( x+2)= 0
x= 9/2, -2
2x^2 -5x -12 -6 = 0
2x^2 - 5x -18= 0
2x^2 +4x -9x -18= 0
2x( x+2) -9( x+2)= 0
( 2x -9)( x+2)= 0
x= 9/2, -2
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