6. X\Xb2- 10x + 21, 7. X\Xb2 + 5x 2013 6, 8. 4r\Xb2+ 20r + 25, 9. 9t\Xb2 - 4, 10. 2x\Xb2 + 3x - 14

6. x²- 10x + 21
7. x² + 5x – 6
8. 4r²+ 20r + 25
9. 9t² - 4
10. 2x² + 3x - 14

 

Step-by-step explanation:

6.(x-3)x(x-7)

7.(x+1)x(x-6)

8.(2r+5)2

9.(3t-2)x(3t+2)

10.2(x2+21)