a) (√7-1)(1+√7)
b) (3+√3)(3-√3)
c) (√2-√6)(√2+√6)
d) (3√2+√10)(3√2-√10)
a) (√7-1)(1+√7)=√7+7-1-√7=6b) (3+√3)(3-√3)=9-3=6c) (√2-√6)(√2+√6)2-6=-4d) (3√2+√10)(3√2-√10)=9*2-10=18-10=8
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a) (√7-1)(1+√7)=√7+7-1-√7=6
b) (3+√3)(3-√3)=9-3=6
c) (√2-√6)(√2+√6)2-6=-4
d) (3√2+√10)(3√2-√10)=9*2-10=18-10=8
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