Question

1.Rezolvati dupa modelul dat:
Model : $(x+y)^{2} + 6(x+y)(x-y) + 9(x+y)^{2} = [(x+y) + 3(x-y)]$
a)$(a + \sqrt{2}x)^{2} - 4(a^{2} - 2x) + 4(a - \sqrt{2}x)^{2} = ?$

Answer 1

a²+2x²-4a²+8x+4a²²-8x²=a²+2x²=(a+x)(a+2x)