Question

50 балов за контртллл​

Answer 1

1. б) 7а² - 2а

2. а(b - c) = ab - ac

-3ma(m² - 2ma + a²) = -3m³a + 6m²a² - 3ma³

(4p² - p) + (5p - 7) - (p² - 7) = 4p² - p + 5p - 7 - p² + 7 =

= 3p² + 4p

3. 6x + 18 = 6(x + 3)

8a² - 12ab = 4a(2a - 3b)

7m - 7n + xm - xn = 7(m - n) + x(m - n) = (m - n)(7 + x)

12m³ - 3m⁴ - 18m⁷ = 3m³(4 - m - 6m⁴)

xy + 7x - 7y - x² = xy - 7y + 7x - x² = y(x - 7) + x(7 - x) = (y - x)(x -7)

4. (x + 7)(x - 2) - x(x + 5) = x² - 2x + 7x - 14 - x² - 5x =

= - 14

5. (2x + 5)(3x - 7) = x(6x - 5) - 23

6x² - 14x + 15x - 35 = 6x² - 5x - 23

x + 5x = - 23 + 35

6x = 12

x = 2