Упростите выражение. 20 баллов!!! 1. (y+2)(y+3)-(y^2+y) 2. (c+2)c+(c+3)(c-3) 3. (6a2 – 3a...

Question

Упростите выражение. 20 баллов!!!

1. (y+2)(y+3)-(y^2+y)
2. (c+2)c+(c+3)(c-3)
3. (6a2 – 3a + 8) – (2a2 – 5);
4. (7х2 – 5х + 3) – (5х2 – 4);
5. (4b2 – 2b + 3) – (6b – 7);

Answer 1

1. (y+2)(y+3)-(y^2+y) = y^2 + 3y + 2y + 6 - y^2 - y = 4y + 6
2. (c+2)c+(c+3)(c-3) = c^2 + 2c + c^2 - 9 = 2c^2 + 2c - 9 
3. (6a^2 – 3a + 8) – (2a^2 – 5) = 6a^2 - 3a + 8 - 2a^2 + 5 = 4a^2 - 3a + 13
4. (7х^2 – 5х + 3) – (5х^2 – 4) = 7x^2 - 5x + 3 - 5x^2 + 4 = 2x^2 - 5x + 7
5. (4b^2 – 2b + 3) – (6b – 7) = 4b^2 - 2b +3 - 6b + 7 = 4b^2 - 8b + 10