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a = √50 - 5√8
ditanya : (a+1)(a-1)...?
jawab :
• (a+b)(a-b) = a^2 - b^2
a^2 = (√50 -5√8)(√50-5√8)
a^2 = 50-10√400 +200
a^2 = 50 -200 +200
a^2 = 50
• a^2 - b^2
• 50 - 1
• 49 #A