factorize it pleaseee helpppp!!!!!
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1. (x+4)^2
4. (3+z)^2
7. 9(2a+1)^2
10. (7a+6b)^2
13.- (9x^2 +6x-1)
16. 4n(m^3 +n)
19. 1+2m+m^2-4Lm
Step-by-step explanation:
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