выполните умножение
1) (b+3)(b-3)=
2) (2-х)(2+х)
3) (k-y)(k+y)=
4) (2c-1)(2c+1)=
5) (8х+4a)(8х-4a)=
1) (b+3)(b-3)=
2) (2-х)(2+х)
3) (k-y)(k+y)=
4) (2c-1)(2c+1)=
5) (8х+4a)(8х-4a)=
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Answers & Comments
a^2 - b^2 = (a + b)(a - b)
1. (b + 3)(b - 3)= b^2 - 9;
2. (2 - х)(2 + х) = 4 - x^2;
3. (k - y)(k + y) = k^2 + y^2;
4. (2c - 1)(2c + 1) = 4c^2 - 1;
5. (8х + 4a)(8х - 4a) = 64х - 16а.