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2x+5 2x+5
b) x^2+5x+6 =(x+3)(x+2)= x+2
x+3 x+3
atau
a) (4x^2+16x+15) : (2x+5) = [(2x+5)(2x+3)] : (2x+5) = 2x+3
b) (x^2+5x+6) : (x+3) = [(x+3)(x+2)] : (x+3) = x+2