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√12(√12) + √12(- √8) + √8(√12) + √8(- √8)
√144 - √96 + √96 - √64
√144 - √64
(√12 × √12) - (√8 × √8)
12 - 8
4
=(√12+√8)(√12-√8)
=√12²-√8²
=12-8
=4