I need help with factoring tinomials!!! please help me by 8 tonight! ?

Question

1. x2 - 8x + 15

2. x2 + 12x + 20

3. x2 + 4x - 32

4. a2 - 15a + 56

5. y2 + 2xy - 63x2

6. a2 + 11 ab + 30b2

7. 50 + 5a - a2

8. x2 + x + 1

9. 21 - 4x - x2

Answer 1

1. x² - 8x + 15 = (x - 5)(x - 3)

2. x² + 12x + 20 = (x + 2)(x + 10)

3. x² + 4x - 32 = (x - 4)(x + 8)

4. a² - 15a + 56 = (a - 8)(a - 7)

5. y² + 2xy - 63x² = -(7x - y)(9x + y)

6. a² + 11ab + 30b² = (a + 5b)(a + 6b)

7. 50 + 5a - a² = -(x - 10)(x + 5)

8. x² + x + 1 = not easily factored.  This has two complex roots.

9. 21 - 4x - x² = -(x - 3)(x + 7)

Hope this helps you!