1.
а)
x не равно 7.
x^2-3x-28=0
D=121
x1=(3-11)/2=-4
x2=(3+11)/2=7
б)
x не равен +-1
6+3×(x-1)-(x+1)^2=0
6+3x-3-x^2-2x-1=0
x^2-x-2=0 D=9
x1=(1 -3)/2= -1; x2=(1+3)/2= 2
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Answers & Comments
1.
а)
x не равно 7.
x^2-3x-28=0
D=121
x1=(3-11)/2=-4
x2=(3+11)/2=7
б)
x не равен +-1
6+3×(x-1)-(x+1)^2=0
6+3x-3-x^2-2x-1=0
x^2-x-2=0 D=9
x1=(1 -3)/2= -1; x2=(1+3)/2= 2