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(a + b)(a – b) = –
(2√5 + 3√2)(2√5 - 3√2) = – = 4 × 5 – 9 × 2 = 2
(2√5)==>>a;
(3√2)==>>b;
(2√5+3√2) •(2√5-3√2) =
(2√5)^2 - (3√2)^2=
4• 5- 9• 2= 20- 18=2;
raíz desaparece cuando el grado
(2√5)= 2^2• (√5)^2=2•2•5=20;
(3√2)= 3^2• (√2)^2= 3•3•2=18;
20-18=2