3 years ago

28x3 + 21x2 + 16x + 12 = 0

2 answers:

7 0

Answer: ( sorry if I’m wrong) 154

Step-by-step explanation:

4 0

Answer:

Step-by-step explanation:

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Svetradugi [14.3K]

From the last two facts, we get

$\dfrac{x_1+x_2+x_3}3=50\implies\dfrac{x_1+x_2+x_3}7=\dfrac{150}7$

$\dfrac{x_5+x_6+x_7}3=70\implies\dfrac{x_5+x_6+x_7}7=30$

Then

$\dfrac{x_1+x_2+\cdots+x_6+x_7}7=60\implies\dfrac{x_4}7=60-\dfrac{150}7-30\implies\boxed{x_4=60}$

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Sergio039 [100]

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