1a) ay - 12bx + 3ax - 4by = (ay + 3ax) - (12bx + 4by) = a(y + 3x) - 4b(3x + y) =
= (3x + y)(a - 4b)
1б) x² - 8x + 15 = (x - 3)(x - 5)
2a) (y - 5)² - (y - 2)5y = y² - 10y + 25 - (5y² - 10y) = y² - 10y + 25 - 5y² + 10y = - 4y² + 25
2б) - 4(p - 2a)² = - 4(p² - 4ap + 4a²) = - 4p² + 16ap - 16a²
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1a) ay - 12bx + 3ax - 4by = (ay + 3ax) - (12bx + 4by) = a(y + 3x) - 4b(3x + y) =
= (3x + y)(a - 4b)
1б) x² - 8x + 15 = (x - 3)(x - 5)
2a) (y - 5)² - (y - 2)5y = y² - 10y + 25 - (5y² - 10y) = y² - 10y + 25 - 5y² + 10y = - 4y² + 25
2б) - 4(p - 2a)² = - 4(p² - 4ap + 4a²) = - 4p² + 16ap - 16a²