1. 2x^2+13x+21=2(x+7/2)(x+3)=(2x+7)(x+3)
D=13^2-4*2*21=169-168=1
x1= -13-1/2*2= -14/4= -7/2
x2= -13+1/2*2= -12/4= -3
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1. 2x^2+13x+21=2(x+7/2)(x+3)=(2x+7)(x+3)
D=13^2-4*2*21=169-168=1
x1= -13-1/2*2= -14/4= -7/2
x2= -13+1/2*2= -12/4= -3