3 years ago

What is the 18th term of the arithmetic sequence 2, -2, -6, -10,...?

Mathematics

1 answer:

OleMash [197]3 years ago

5 0

Answer: B- 70

Step-by-step explanation:

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3 years ago

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3 years ago

X^4-28x^2=0 solve algebraically

Paha777 [63]

$x^4 - 28x^2 = 0$

$x^2(x^2 - 28) = 0$

$x^2 = 0 \ \ or \ \ (x^2 - 28) = 0$

$x = 0 \ \ or \ \ x^2 = 28$

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$x = 0 \ \ or \ \ x = \pm2 \sqrt{7}$

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Answer : x = 0 or 2√7 or -2√7
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3 years ago