Question

1:(a + 2d)(a - 2d).2:(x + 7)(7-х).​

Answer 1

Ответ:

1)a^2-4d^2

2)49-x^2

Answer 2

It looks like you have two expressions that you want to simplify. Let's simplify each expression:

1. (a + 2d)(a - 2d)

This expression is in the form of a difference of squares, which can be simplified using the formula: (a^2 - b^2) = (a + b)(a - b).

In your case, a = a and b = 2d, so:

(a + 2d)(a - 2d) = a^2 - (2d)^2

Now, simplify further:

a^2 - (2d)^2 = a^2 - 4d^2

So, the simplified expression is a^2 - 4d^2.

2. (x + 7)(7 - x)

This expression is also in the form of a difference of squares. You can apply the same formula:

(x + 7)(7 - x) = (x + 7)(-(x - 7))

Now, simplify further by factoring out the negative sign:

(x + 7)(-(x - 7)) = -(x + 7)(x - 7)

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

Those are the simplified forms of the given expressions.