Question

(а-у)(а+у)(а×а+у×у)=?
(7х+1)(7х-1)(49х×49х+1)

Answer 1

$(a - y)(a + y)(a {}^{2} + y {}^{2} ) \\ (a {}^{2} + ay - ay - y {}^{2} )(a { }^{2} + y {}^{2} ) \\ (a {}^{4} + a {}^{2} y {}^{2} - a {}^{2} y {}^{2} - y {}^{4} ) \\ a {}^{4} - y {}^{4}$
(7x+1)(7x-1)(2401x²+1)
(49x²-7x+7x-1)(2401x²+1)
117649x⁴+49x²-2401x²-1
117649x⁴-2352x²-1