Coefficients from a repeated factor
Coefficients from a repeated factor
5 marks
TGM Original
The monic cubic P(x)=x3+ax2+bx+20 has (x+2)2 as a factor. Find a,b and factorise P fully.
Solution:
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Answer:\(a=9,\ b=24\); \(\mathrm{P}(x)=(x+2)^2(x+5)\).
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