\(\left|x\right|=2\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)
Khi x = 2:
\(E=5.2^2-3.2.\left(-1\right)\\ E=20-\left(-6\right)=26\)
Khi x = -2
\(E=5.\left(-2\right)^2-3.\left(-2\right).\left(-1\right)\\ E=20-6=14\)
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x|=2⇒[x=2x=−2
Trg khi x = 2:
E=5.22−3.2.(−1)E=20−(−6)=26
Trong khi x = -2
E=5.(−2)2−3.(−2).(−1)E
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