#148. D=(-6)^2-4*1*5=36-20=16=4^2
#149. D=(-7)^2-4*1*12=49-48=1
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#148. D=(-6)^2-4*1*5=36-20=16=4^2
#149. D=(-7)^2-4*1*12=49-48=1