Chapter 9: Problem 1
Multiply 8023 by 4638 using the method of al-Uqlidis?
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Chapter 9: Problem 1
Multiply 8023 by 4638 using the method of al-Uqlidis?
These are the key concepts you need to understand to accurately answer the question.
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Give a complete inductive proof of the result $$ \sum_{i=1}^{n} i^{3}=\left(\sum_{i=1}^{n} i\right)^{2} $$ and compare with al-Karaji's proof.
Use al-T?si's method to solve the spherical triangle with known sides of \(40^{\circ}\) and \(50^{\circ}\) and with the angle between those sides equal to \(25^{\circ}\).
Show, using the formulas for sums of fourth powers and squares, that $$ \begin{aligned} \sum_{i=1}^{n-1}\left(n^{4}-2 n^{2} i^{2}+i^{4}\right) &=\frac{8}{15}(n-1) n^{4}+\frac{1}{30} n^{4}-\frac{1}{30} n \\ &=\frac{8}{15} n \cdot n^{4}-\frac{1}{2} n^{4}-\frac{1}{30} n \end{aligned} $$
Show that \(x^{3}+c x=b x^{2}+d\) is the only one of al-Khayy?mi's cubics that could have three positive solutions. Under what conditions do these three positive solutions exist? How many positive solutions does the equation \(x^{3}+\) \(200 x=20 x^{2}+2000\) have? (The solution of this equation enabled al-Khayy?mi to solve his quadrant problem.)
Solve \(\frac{1}{2} x^{2}+5 x=28\) by multiplying first by 2 and then using al- Khw?rizmi's procedure. Similarly, solve \(2 x^{2}+\) \(10 x=48\) by first dividing by 2
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