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3-1=7
2=7
2*4-1=7
8-1=7
7=7.
2*5-1=7
10-1=7
9=7
b) 6=3-3*(-1)
6=3-(-3)
6=3+3
6=6
6=3-3*1
6=3-3
6=0
6=3-3*2
6=3-6
6=-3
c) x^2+3=28
25^2+3=28
625+3=28
628=28
5^2+3=28
25+3=28
28=28
-5^2+3=28
25+3=28
28=28
d) 2n(n-7)=0
2n^2-14n=0
2*(-7)^2-14*(-7)=0
2*49-(-98)=0
98+98=0
196=0
2*0^2-14*0=0
0-0=0
0=0
2*7^2-14*7=0
2*49-98=0
98-98=0
0=0
^ = do potęgi
P.S. Mam nadzieję, ze pomogłam :)