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(a-2)(a-4)+(b+1)(b-5)>b-10

Răspuns :

[tex] a^{2} -4a-2a+8[/tex]+[tex] b^{2}-5b+b-5 \ \textgreater \ b-10 [/tex]
[tex] a^{2}-6a+ 8+b^{2} -4b-5-b+10\ \textgreater \ 0 \\ a^{2} + b^{2} -6a-5b+13\ \textgreater \ 0 \\ [/tex]
Din pacate numai pina aici.
(a-2)(a-4)+(b+1)(b-5)>b-10
a²-4a-2a+8+b²-5a+1-5>b-10
a²+b²+4>b-10
a²+b²+b>7