Question

(7а+у)(у-7а)решите пж​

Answer 1

Ответ:

у²-49а²

Объяснение:

(7а+у)(у-7а)

воспользуемся формулой сокращенного умножения

х²-у²=(х-у)(х+у)

(7а+у)(у-7а)=(у+7а)(у-7а)=у²-(7у)²=у²-49а²

Answer 2

To solve the expression (7a + y)(y - 7a), we can use the FOIL method, which stands for "First, Outer, Inner, Last":

First: Multiply the first term of each set of parentheses together: 7a * y = 7ay Outer: Multiply the outer terms of each set of parentheses together: 7a * -7a = -49a^2 Inner: Multiply the inner terms of each set of parentheses together: y * y = y^2 Last: Multiply the last term of each set of parentheses together: y * -7a = -7ay

Now we can combine the results of these multiplications:

7ay - 49a^2 + y^2 - 7ay

The 7ay and -7ay terms cancel each other out, leaving:

-49a^2 + y^2

Therefore, the simplified expression is -49a^2 + y^2.