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CBSE Class 12-science Answered

Prove this please I need this..

Asked by 2003.m.harsh | 24 Apr, 2020, 12:29: PM

Expert Answer

TO prove that: |a, a+c, a-b // b-c, b, b+a // c+b, c-a, c| = (a+b+c)(a²+b²+c²)

C o n s i d e r comma space L H S space equals space open vertical bar table row a cell a plus c end cell cell a minus b end cell row cell b minus c end cell b cell b plus a end cell row cell c plus b end cell cell c minus a end cell c end table close vertical bar M u l t i p l y i n g space R subscript 1 space w i t h space a comma space R subscript 2 space w i t h space b space a n d space R subscript 3 space w i t h space c space r e s p e c t i v e l y comma space w e space h a v e L H S equals fraction numerator 1 over denominator a b c end fraction open vertical bar table row cell a squared end cell cell a squared plus a c end cell cell a squared minus a b end cell row cell b squared minus b c end cell cell b squared end cell cell b squared plus a b end cell row cell c squared plus b c end cell cell c squared minus a c end cell cell c squared end cell end table close vertical bar equals fraction numerator 1 over denominator a b c end fraction open vertical bar table row cell a squared plus b squared plus c squared end cell cell a squared plus b squared plus c squared end cell cell a squared plus b squared plus c squared end cell row cell b squared minus b c end cell cell b squared end cell cell b squared plus a b end cell row cell c squared plus b c end cell cell c squared minus a c end cell cell c squared end cell end table close vertical bar space space space space... space A p p l y i n g space R subscript 1 rightwards arrow R subscript 1 plus R subscript 2 plus R subscript 3 equals fraction numerator left parenthesis a squared plus b squared plus c squared right parenthesis over denominator a b c end fraction open vertical bar table row 1 1 1 row cell b squared minus b c end cell cell b squared end cell cell b squared plus a b end cell row cell c squared plus b c end cell cell c squared minus a c end cell cell c squared end cell end table close vertical bar space space space equals fraction numerator left parenthesis a squared plus b squared plus c squared right parenthesis over denominator a b c end fraction open vertical bar table row 1 0 0 row cell b squared minus b c end cell cell b c end cell cell a b plus b c end cell row cell c squared plus b c end cell cell negative a c minus b c end cell cell negative b c end cell end table close vertical bar equals fraction numerator b c left parenthesis a squared plus b squared plus c squared right parenthesis over denominator a b c end fraction open vertical bar table row 1 0 0 row cell b minus c end cell c cell a plus c end cell row cell c plus b end cell cell negative a minus b end cell cell negative b end cell end table close vertical bar equals fraction numerator left parenthesis a squared plus b squared plus c squared right parenthesis over denominator a end fraction open square brackets negative b c plus a squared plus a c plus a b plus b c close square brackets subscript blank equals fraction numerator left parenthesis a squared plus b squared plus c squared right parenthesis a over denominator a end fraction open square brackets a plus b plus c close square brackets equals left parenthesis a plus b plus c right parenthesis left parenthesis a squared plus b squared plus c squared right parenthesis

Answered by Renu Varma | 24 Apr, 2020, 06:29: PM

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