SOLUTION: Factor: 1.28b+2ay+bx+xy 2. y^2-7y-18 3. Y^2-13y+40 4.x^2-x-30 5. 8x^2-14x-15 6. 12a^2+81-21 7.3a(a-4)-(4-a)

Question 168583: Factor:
1.28b+2ay+bx+xy
2. y^2-7y-18
3. Y^2-13y+40
4.x^2-x-30
5. 8x^2-14x-15
6. 12a^2+81-21
7.3a(a-4)-(4-a)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Factor:
1.28b+2ay+bx+xy
I think you have posted this incorrectly.
--------------------------------------------
2. y^2-7y-18
(y-9)(y+2)
-------------------------------------------
3. Y^2-13y+40
(y-5)(y-8)
--------------------------------------------
4.x^2-x-30
(x-6)(x+5)
------------------------------------------
5. 8x^2-14x-15
8x^2 -20x + 6x - 15
4x(2x -5) + 3(2x-5)
(2x-5)(4x+3)
-----------------------------------
6. 12a^2+81-21
12a^2+60
12(a^2+5)
-----------------------------------
7.3a(a-4)-(4-a)
= 3a(a-4)+(a-4)
= (a-4)(3a+1)
=======================
Cheers,
Stan H.

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