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If a polynomial with real coefficient has a complex zero, the conjugate of that number will be a zero as well.
So, if 4-6i is a zero, 4+6i will be a zero as well
If -2+11i is a zero, -2-11i will be a zero as well
So, the zeroes are
15×20×10=3000
10×20×15=3000
3000+3000=6000
10×20×15=3000
3000+3000=6000