Question

Разложите на множители выражение:

Answer 1

$1)x {}^{2} - 4a {}^{2} \\ x {}^{2} - 2 {}^{2} a {}^{2} \\ x {}^{2} - (2a) {}^{2} \\ (x - 2a) \times (x + 2a) \\ \\ 2) - 15x {}^{2} + 15 \\ - 15(x {}^{2} - 1) \\ - 15(x - 1) \times (x + 1) \\ \\ 3) \frac{a {}^{2} }{25} - \frac{c {}^{2} }{49} \\ \\ \frac{1}{1225} \times (49a {}^{2} - 1225 \times \frac{c {}^{2} }{49} ) \\ \\ \frac{1}{1225} \times (49a {}^{2} - 25c {}^{2} ) \\ \\ \frac{1}{1225 } \times (7a - 5c) \times (7a + 5c)$