3. Obtén los productos notables. a x-2y2= b 3a+72= c 6x2-12= d 2ab+52= e 3r2t-22= f 4x3+2y2= g 8m6+3n2= h 7u3v+4r42= i square root of 5y2- square root of 10z22= j cube root of2a- square root of 2b2=

(1) x^{2} - 4 x y + 4 y^{2}(2) 9 a^{2} + 42 a + 49(3) 36 x^{4} - 12 x^{2} + 1(4) 4 a^{2} b^{2} + 20 a b + 25(5) 9 r^{4} t^{2} - 12 r^{2} t + 4(6) 16 x^{6} + 16 x^{3} y + 4 y^{2}(7) 64 m^{12} + 48 m^{6} n + 9 n^{2}(8) \sqrt[3]{4} a^{2} - 2 \sqrt[6]{32} a b + 2 b^{2}