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<=> (2x2+4x) (3x+6)
<=> 2x(x+2) 3(x+2)
<=> (2x+3) (x+2)
<=> x= -3/2 atau x= -2
b. 4x2+3x-10=0 <=> 4x2-5x+8x-10
<=> (4x2-5x) (8x-10)
<=> x(4x-5) 2(4x-5)
<=> (x+2) (4x-5)
<=> x= -2 atau x = 5/4