Question

solve using identity

Answer 1

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Answer 2

$( ab + bc )^{2} - 2ab^{2} c \\ \\ Using Identity I ==> ( x + y )^{2} =x^{2} +y^{2} +2xy \\ \= ( a^{2}b^{2} + b^{2}c^{2} + 2ab^{2}c ) - 2ab^{2} c \\ \\ =a^{2}b^{2} + b^{2}c^{2} \\ \\ = b^{2}*( a^{2} + c^{2} )$