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= 7√( 25 x 2) - 2√( 9 x 2) - 2√(16 x 2)
= 35√2 - 6√2 - 8√2
= 21√2
b. (6√3 - 2√2)( 6√3 + 2√2)
= (6√3)(6√3) + (6√3)(2√2) + (-2√2)(6√3) + (-2√2)(2√2)
= 108 + 12√6 - 12√6 - 8
= 100