Question

Descompuneti in factori expresia:
E(x)=x la puterea 3 - 7x la puterea 2 - 12x

Answer 1

 [tex]E(x)=x^3-7x^2-12x=x(\underbrace{x^2-7x-12})=...\;;\\ \Delta=(-7)^2-4\cdot1\cdot(-12)=97\;;\\ x_{1;2}=\frac{7\pm\sqrt{97}}{2}\;\;adica:\;x_1=\frac{7+\sqrt{97}}{2}\;si\;x_2=\frac{7-\sqrt{97}}{2}\\ \Rightarrow\;\;E(x)=...=x(x-x_1)(x-x_2) = .....[/tex]

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