SNBT Zone : Suku Banyak (Polinom)
Table of Contents
Tipe:
No.
Jika- 4
- 9
- 10
- 16
- 22
ALTERNATIF PENYELESAIAN
\(x_1+x_2+x_3=-\dfrac{b}a=-\dfrac{-4}1=4\)
\(x_1x_2 + x_2x_3+x_1x_3=\dfrac{c}a=\dfrac{3}1=3\)
\(\begin{aligned} x_1^2+x_2^2+x_3^2&=\left(x_1+x_2+x_3\right)^2-2\left(x_1x_2 + x_2x_3+x_1x_3\right)\\ &=\left(4\right)^2-2\left(3\right)\\ &=16-6\\ &=\color{blue}\boxed{\boxed{\color{black}10}} \end{aligned}\)
\(x_1x_2 + x_2x_3+x_1x_3=\dfrac{c}a=\dfrac{3}1=3\)
\(\begin{aligned} x_1^2+x_2^2+x_3^2&=\left(x_1+x_2+x_3\right)^2-2\left(x_1x_2 + x_2x_3+x_1x_3\right)\\ &=\left(4\right)^2-2\left(3\right)\\ &=16-6\\ &=\color{blue}\boxed{\boxed{\color{black}10}} \end{aligned}\)
Jadi, x12 + x22 + x32 = 10.
JAWAB: C
JAWAB: C
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