Question

-16/49+(4/7-d)(d+4/7)​

Answer 1

Ответ: -16/49+16/49-d^2=-d^2.

Объяснение:

Answer 2

To simplify the given expression $-\frac{16}{49} + \left(\frac{4}{7} - d\right)\left(d + \frac{4}{7}\right)$, we can start by expanding the second term and then simplifying the resulting expression.

First, let's expand the second term $\left(\frac{4}{7} - d\right)\left(d + \frac{4}{7}\right)$:

$$\left(\frac{4}{7} - d\right)\left(d + \frac{4}{7}\right) = \frac{4}{7}d + \frac{16}{49} - d^2 - \frac{4}{7}d.$$

Now, simplify the expression by combining like terms:

$$\frac{4}{7}d - \frac{4}{7}d - d^2 + \frac{16}{49} = -d^2 + \frac{16}{49}.$$

The given expression can now be written as $-\frac{16}{49} - d^2 + \frac{16}{49}$.

Simplifying further, the expression becomes $-d^2$.