Question

7tквадрат -7d квадрат

Answer 1

7t^2-7d^2=7(t^2-d^2)=7(t-d)(t+d)

Ответ: 7(t-d)(t+d)

Answer 2

It appears that you want to perform some mathematical calculations with variables. However, the expression you provided is not entirely clear. It seems you want to calculate the difference between two squares: 7t^2 - 7d^2.

To simplify the expression, you can factor out the common term, which in this case is 7:

7t^2 - 7d^2 = 7(t^2 - d^2)

Now, you can further simplify the expression using the difference of squares identity, which states that a^2 - b^2 = (a + b)(a - b):

7(t^2 - d^2) = 7(t + d)(t - d)

So, the simplified expression is 7(t + d)(t - d).