Question

(a+7)(a-3)-(a-6)(a+2) если a =2​

Answer 1

Ответ:

а(7-3)-а(-6+4)=5а-2а=3а

3а=3×2=6

Answer 2

To find the value of the expression $(a+7)(a-3)-(a-6)(a+2)$ when $a = 2$, we substitute $a$ with $2$ and evaluate the expression.

Let's calculate it step by step:

$(2+7)(2-3)-(2-6)(2+2)$

Simplifying inside each bracket first:

$= (9)(-1) - (-4)(4)$

Now, perform the multiplications:

$= -9 - (-16)$

Next, simplify the subtraction:

$= -9 + 16$

Finally, perform the addition:

$= 7$

Therefore, when $a = 2$, the expression $(a+7)(a-3)-(a-6)(a+2)$ evaluates to $7$.