Solve?????????????????

Mathematics

1 answer:

Shtirlitz [24]2 years ago

8 0

Answer,

x = 5/2 + 1/2 √57 or x = 5/2 + -1/2 √57

Explanation,

Step 1: Use quadratic formula with a=1, b=-5, c=-8.

It's kinda hard to type out again so I just took a pic :-)

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Nadusha1986 [10]

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Step-by-step explanation:

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3 years ago

What is the sum of the geometric series

lbvjy [14]

If $S$ denotes the sum of the first $n$ terms of a geometric series with first term $a$ and common ratio $r$ , then

$S=a+ar+ar^2+\cdots+ar^{n-3}+ar^{n-2}+ar^{n-1}$
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$\implies S-rS=a+(ar-ar)+(ar^2-ar^2)+\cdots+(ar^{n-1}-ar^{n-1})-ar^n$
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$\displaystyle\sum_{x=0}^{15}2\left(\frac14\right)^x=2\dfrac{1-\left(\frac14\right)^{16}}{1-\frac14}\approx2.67$

Rounded to the nearest whole number, the answer would be 3.

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3 years ago

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