Question

Упрости выражение 1. (a-3)²-a(a - 6) = ?2. (x+5)² - (x-5)² = ?3. (Z- 2)²+(z-5)²(z+7) = ?4. 1 - (2x -1)² = ?

Answer 1

Объяснение:

1. а в 3 -10а в 2 +33а-27

2. 20х

4.4х•(1-х)

Answer 2

1. (a-3)² - a(a-6) = (a-3)(a-3) - a(a-6) = a² - 6a + 9 - a² + 6a = 9

2. (x+5)² - (x-5)² = (x+5)(x+5) - (x-5)(x-5) = x² + 10x + 25 - (x² - 10x + 25) = x² + 10x + 25 - x² + 10x - 25 = 20x

3. (Z-2)² + (z-5)²(z+7) = (Z-2)(Z-2) + (z-5)(z-5)(z+7) = Z² - 4Z + 4 + z² - 10z + 25(z+7) = Z² - 4Z + 4 + z² - 10z + 25z + 175 = Z² + z² - 4Z - 10z + 25z + 4 + 175 = 2z² + 15z + 179

4. 1 - (2x-1)² = 1 - (4x² - 4x + 1) = 1 - 4x² + 4x - 1 = -4x² + 4x