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Pertanyaan

Jika a dan b adalah bilangan real positif, maka nilai dari adalah ....

Jika  dan  adalah bilangan real positif, maka nilai dari fraction numerator begin mathsize 14px style left parenthesis square root of a plus square root of b right parenthesis end style to the power of size 14px 2 size 14px plus begin mathsize 14px style left parenthesis square root of a minus square root of b right parenthesis end style to the power of size 14px 2 over denominator size 14px a size 14px plus size 14px b end fraction adalah ....

  1. begin mathsize 14px style a minus b end style

  2. square root of size 14px a size 14px minus square root of size 14px b

  3. begin mathsize 14px style 1 end style

  4. begin mathsize 14px style 2 end style

  5. begin mathsize 14px style 2 a b end style

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Pembahasan

Perhatikan bahwa dan Maka, didapat hasil sebagai berikut Jadi, jawabannya adalah D.

Perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses square root of a plus square root of b close parentheses squared end cell equals cell square root of a square root of a plus square root of a square root of b plus square root of a square root of b plus square root of b square root of b end cell row blank equals cell open parentheses square root of a close parentheses squared plus 2 square root of a square root of b plus open parentheses square root of b close parentheses squared end cell row blank equals cell a plus 2 square root of a b end root plus b end cell end table end style

dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses square root of a minus square root of b close parentheses squared end cell equals cell square root of a square root of a minus square root of a square root of b minus square root of a square root of b plus square root of b square root of b end cell row blank equals cell open parentheses square root of a close parentheses squared minus 2 square root of a square root of b plus open parentheses square root of b close parentheses squared end cell row blank equals cell a minus 2 square root of a b end root plus b end cell end table end style

Maka, didapat hasil sebagai berikut

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator left parenthesis square root of a plus square root of b right parenthesis squared plus left parenthesis square root of a minus square root of b right parenthesis squared over denominator a plus b end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator left parenthesis a plus 2 square root of a b end root plus b right parenthesis plus left parenthesis a minus 2 square root of a b end root plus b right parenthesis over denominator a plus b end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator a plus a plus 2 square root of a b end root minus 2 square root of a b end root plus b plus b over denominator a plus b end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator 2 a plus 2 b over denominator a plus b end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator 2 left parenthesis a plus b right parenthesis over denominator a plus b end fraction end cell end table equals 2 end style

Jadi, jawabannya adalah D.

 

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