### Answers (42)

 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

### Accounts (8)

 Mathematics 811 rep 55 silver badges2424 bronze badges Arqade 148 rep 11 silver badge1010 bronze badges Stack Overflow 130 rep 22 silver badges1515 bronze badges Meta Stack Exchange 113 rep 55 bronze badges Chess 101 rep 22 bronze badges

### Badges (26)

 Yearling × 3 Investor Caucus Revival Constituent Organizer Enthusiast Quorum Altruist Excavator

### Active bounties (0)

This user has no active bounties

### Votes cast (124)

all time   by type
110 up 46 question
14 down 78 answer