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Class8th,Ex.5.2

Exercise 5.2 Question 1(a) Expand: \[ (a+b+2c)^2 \] Solution: Using the identity \[ (x+y+z)^2=x^2+y^2+z^2+2xy+2yz+2zx \] Here, \[ x=a,\qquad y=b,\qquad z=2c

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