1.

19. x2 – m2 + 6mn - 9n2​

Answer»

Step-by-step EXPLANATION:

x²-m²+6mn-9n²

x²-m²+(2m-3n)n=0

(x-m) (x+m)+(2m-3n)n=0

x=m

2x-3n=0

x=3n/2



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