A father and his son can complete a piece of work in 4 days, while the father alone can complete it in 6 days. Both of them work for 2 days, then the father had to leave. How long will the son take to complete the remaining work?
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Answer:
(x+3)2
=(x+3)(x+3)
=(x)(x)+(x)(3)+(3)(x)+(3)(3)
=x2+3x+3x+9
=x2+6x+9
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