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19. x2 – m2 + 6mn - 9n2 |
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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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