Matematică
badicclaudiu
2016-04-17 07:25:48
ma ajutati va rog la ex 1 si 2
Răspunsuri la întrebare
Ancaelenaew
2016-04-17 11:10:59

    [latex]displaystyle\ 1)\ log_216+log_3frac{1}{9}=\\=log_22^4+log_33^{-2}=\\ =4log_22 -2log_33=4-2=2=sqrt[3]{2^3}=oxed{sqrt[3]{8} extless sqrt[3]{9}}\\\ 2)\ ext{Calculam solutiile ecuatiei atasate functiei,}\ ext{care sunt abscisele punctelor in care graficul functiei taie axa Ox.}\\ x^2+3x-10=0\\ x_{12}=frac{-bpmsqrt{b^2-4ac}}{2a}=frac{-3pmsqrt{9+40}}{2}=frac{-3pm sqrt{49}}{2}=frac{-3pm 7}{2}\\ x_1=frac{-3+7}{2}=frac{-3+7}{2}=2\ x_2 extless 0 [/latex] [latex]Longrightarrow~~~f(2) = 2^2+3cdot 2-10 = 4 + 6 - 10=10 - 10 = oxed{0}\\ Longrightarrow~~~f(0)cdot f(1)cdot f(2)cdot f(3)cdots f(2015)=\\ =f(0)cdot f(1)cdot 0cdot f(3)cdots f(2015)=oxed{0}[/latex]

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