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Factor out the greatest possible common factor.
1. 20x - 35
2. 48x2 – 8b
3. 15y6 – 20y4 + 25y2
4. 8x2y2 + 16x2y – 40xy2
Factor each expression into two binomials.
5. x2 – 25
6. a2 – 121
7. 4b2 – 9
8. y2 – 100z2
Factor completely, first factor out a common factor then, if possible, factor the difference of two perfect squares.
9. 10x2 - 160
10. 45a3 – 5a