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b). (√2+a) (a-√2)+(-3√2+2a)² = √2a-2+a²-√2a+18-12√2a+4a² = 5a²+12√2a+16
10x2-15xy-(9x2-12xy+4y2)
10x2-15xy- 9x2 +12xy-4y2
x2-4y2-3xy
b)
a2-2+(4a2-12√2 a+18)
a2-2+4a2-12√2 a+18
5a2-12√2 a+16
a(5a-12√2)+16