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Explain Solution R.D.Sharma Class 12 Chapter 28 The Plane  Exercise 28.13 Question 17 Sub Question 2 Maths Textbook Solution.

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\begin{aligned} &(a-5)[(3-a)(2-a)-2]=0 \\ &(a-5)(6-3 a-2 a+a 2-2)=0 \\ &a^{3}-10 a^{2}+29 a-20=0 \\ &0(a-1)(a-4)(a-5)=0 \\ &a=1,4,5 \end{aligned}

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