a)x²+6x+9-4=0
x²+6x+5=0
d=6²-4*1*5=36-20=16
x1=(-6-√16)/2*1=(-6-4)/2=-10/2=-5
x2=(-6+√16)/2*1=(-6+4)/2=-2/2=-1
b) x²-6x+9-2x+6-15=0
x²-8x=0
x(x-8)=0
x1=0 x2=8
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Answers & Comments
a)x²+6x+9-4=0
x²+6x+5=0
d=6²-4*1*5=36-20=16
x1=(-6-√16)/2*1=(-6-4)/2=-10/2=-5
x2=(-6+√16)/2*1=(-6+4)/2=-2/2=-1
b) x²-6x+9-2x+6-15=0
x²-8x=0
x(x-8)=0
x1=0 x2=8