MCQ
જો $A$ અને $B$ શ્રેણિકો માટે $AB=A$ અને $BA=B,$ તો $A^2+B^2= ...........$
- A$2BA$
- B$2AB$
- C$A-B$
- ✓$A+B$
$A^2+B^2=AA+BB$
$=(AB)A+(BA)B$
$\because A = AB, B=BA)$
$=A(BA)+B(AB)$ (જૂથનો નિયમ)
$=AB+BA (\because BA=B \ \ \ \ \ AB=A)$
$=A+B (\because AB=A,BA=B)$
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