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Question of The Day30-12-2019

If x+y+z=0, then $$\frac{x^2 + yz}{yz}+\frac{y^2 + zx}{zx}+\frac{z^2 + xy}{xy}=?$$

Correct Answer : b ) 6

Explanation :

Consider the given expression

$$\frac{x^2 +yz}{yz}+\frac{y^2 + zx}{zx}+\frac{z^2 + xy}{xy}$$

or

$$=\frac{x^3+xyz}{xyz}+\frac{y^3+xyz}{xyz}+\frac{z^3+xyz}{xyz}$$

$$=\frac{x^3+y^3+z^3+3xyz}{xyz}$$

As x+y+z=0

So, x3+y3+z3= 3xyz

Thus, putting the value of (x3+y3+z3) in our expression we get

$$\Rightarrow \frac{x^3+y^3+z^3+3xyz}{xyz}$$

$$\Rightarrow \frac{3xyz+3xyz}{xyz}$$

= 6

Hence, (b) is the correct answer.

Questions related to Algebra are asked in exams like SSC CGL, SSC MTS, SSC CPO, SSC CHSL, RRB JE, RRB NTPC, RRB GROUP D, RRB OFFICER SCALE-I, IBPS PO, IBPS SO, RRB Office Assistant, IBPS Clerk, etc.

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