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The number of distinct real roots of the equation \(|x+1||x+3|-4|x+2|+5=0\), is _______. 

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Best answer

Correct answer is :

\(|x+1||x+3|-4|x+2|+5=0\)

case- 1

\(\mathrm{x} \leq-3\)

\((\mathrm{x}+1)(\mathrm{x}+3)+4(\mathrm{x}+2)+5=0\)

\(\mathrm{x}^{2}+4 \mathrm{x}+3+4 \mathrm{x}+8+5=0\)

\(\mathrm{x}^{2}+8 \mathrm{x}+16=0\)

\((\mathrm{x}+4)^{2}=0\)

\(\mathrm{x}=-4\)

case-2

\(-3 \leq \mathrm{x} \leq-2\)

\(-\mathrm{x}^{2}-4 \mathrm{x}-3+4 \mathrm{x}+8+5=0\)

\(-\mathrm{x}^{2}+10=0\)

\(\mathrm{x}= \pm \sqrt{10}\)

case-3

\(-2 \leq \mathrm{x} \leq-1\)

\(-x^{2}-4 x-3-4 x-8+5=0\)

\(-x^{2}-8 x-6=0\)

\(\mathrm{x}^{2}+8 \mathrm{x}+6=0\)

\(x=\frac{-8 \pm 2 \sqrt{10}}{2}=-4 \pm \sqrt{10}\)

case-4

\(\mathrm{x} \geq-1\)

\(x^{2}+4 x+3-4 x-8+5=0\)

\(\mathrm{x}^{2}=0\)

\(\mathrm{x}=0\)

No. of solution = 2

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