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= (√2)² - √10 + √10 - (√5)²
= √4 - √25
= 2 - 5
= -3
b. (√5 - √7)(√5+√7)
= (√5)² +√35 - √35 - (√7)²
= √25 - √49
= 5 - 7
= -2
c. dak jelas ap soalny
semoga dapat membantu
b. 5+ √35 - √35 - 7 = -2
c. 2√7 + 2√12 = 2√7 + 2(2√3) = 2√7 + 4√3