Obinna Nwakwue

 7 Prove that 2003 is prime. 5 How do I multiply $\frac{8y-4}{10y-5}\times \frac{5y-15}{3y-9}$? 3 How can we prove that a quadratic equation has at most 2 roots? 3 Show that the set {3, 6 , 9 , 12 , 15 … } is countable. 2 Does $2^2=4$ imply $2=\pm \sqrt{4}$?

### Reputation (811)

 +10 How do I multiply $\frac{8y-4}{10y-5}\times \frac{5y-15}{3y-9}$? +10 Why is it useful to find the domain and range of a function graph +10 Reference suggestion: eigenvalues of tridiagonal matrices -2 Notation for double-integrals - partial or full differentials?

### Questions (10)

 17 Is calculating the summation of derivatives “mathematically sound”? 4 Name of $\prod_{n = 1}^{\infty}n = 1 \times 2 \times 3 \times 4 \times 5 \times \cdots$ 4 Why does $\left(\frac b2\right)^2$ “geometrically complete the square?” 3 Is $\frac{d}{dx}\left(\sum_{n = 0}^\infty x^n\right) = \sum_{n = 0}^\infty\left(\frac{d}{dx} x^n \right)$ true? 3 2048 Logic Puzzle

### Tags (51)

 10 algebra-precalculus × 15 4 factoring × 2 8 rational-functions × 9 3 sequences-and-series × 5 7 quadratics × 6 3 functions × 3 7 prime-numbers 3 discrete-mathematics × 2 5 polynomials × 3 2 derivatives × 4