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 12 Prove a square can't be written $5x+ 3$, for all integers $x$. 6 Why can ALL quadratic equations be solved by the quadratic formula? 5 Interesting and unexpected applications of $\pi$ 4 If $A$ is a $7 \times 5$-matrix, what is the lowest possible dimension of Nul $A$? 3 Do not understand formula…

### Reputation (971)

 +30 Why can ALL quadratic equations be solved by the quadratic formula? +10 Interesting and unexpected applications of $\pi$ +10 Finding the volume of a solid by rotating two curves about the $y$-axis +5 Factoring $x^n + y^n$ over the integers

### Questions (4)

 3 Factoring $x^n + y^n$ over the integers 1 How may we find this limit? 1 Mirror Matrix Multiplication -4 Fun math riddle

### Tags (53)

 14 algebra-precalculus × 7 6 calculus × 8 12 square-numbers 6 integration × 5 8 polynomials × 3 5 pi 8 quadratics × 2 3 congruences × 3 7 linear-algebra × 5 3 arithmetic

### Accounts (2)

 Mathematics 971 rep 315 Mathematics Educators 101 rep 1