(a²-3)²-(3+a²)²=(a²)²-2*a²*3+3²-(3²+2*3*a²+(a²)²)=a⁴-6a²+9-(9+6a²+a⁴)=
=a⁴-6a²+9-9-6a²-a⁴=-12a²
Korzystamy ze wzoru sróconego mnożenia:
(a+b)²=a²+2ab+b²
i
(a-b)²=a²-2ab+b²
Mozna sprytniej ze wzoru a²-b²=(a+b)(a-b)
(a²-3+a²+3)(a²-3-a²-3)=2a²*(-6)=-12a²
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(a²-3)²-(3+a²)²=(a²)²-2*a²*3+3²-(3²+2*3*a²+(a²)²)=a⁴-6a²+9-(9+6a²+a⁴)=
=a⁴-6a²+9-9-6a²-a⁴=-12a²
Korzystamy ze wzoru sróconego mnożenia:
(a+b)²=a²+2ab+b²
i
(a-b)²=a²-2ab+b²
Mozna sprytniej ze wzoru a²-b²=(a+b)(a-b)
(a²-3+a²+3)(a²-3-a²-3)=2a²*(-6)=-12a²