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= ( √7 + √2 ) ( √7 + √2 )
= ( √7 )^2 + 7 ( √7 ) ( √2) + (√2) ^2
= 7 + 7 √ 14 + 4
= 7 + 4 + 7√ 14
= 11 + 7√ 14
c. (√7+√2) (√7-√2)
= ( √7 ) ^2 - ( √2 )^2
= 7 - 2
= 5
2. c. √18 + √8
√18 + √8
= √ 2 x 9 + √ 2 x 4
= 2 √ 3 + 2 √ 2
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