Question

(X+7)^2 + 2(x+7)x-5)+(x-5)^2 если x =3.5

Answer 1

Всё лови ответ не за что

Answer 2

To find the value of the expression $(x+7)^2 + 2(x+7)x-5)+(x-5)^2$ when $x = 3.5$, we simply substitute $x$ with $3.5$ and perform the calculations. Let's do that step by step:

Step 1: Substitute $x$ with $3.5$: $(3.5 + 7)^2 + 2(3.5 + 7) \cdot 3.5 - 5 + (3.5 - 5)^2$

Step 2: Perform the operations within the parentheses: $10.5^2 + 2 \cdot 10.5 \cdot 3.5 - 5 + (-1.5)^2$

Step 3: Calculate the squares: $110.25 + 73.5 - 5 + 2.25$

Step 4: Perform the addition and subtraction: $110.25 + 73.5 - 5 + 2.25 = 180$

So, when $x = 3.5$, the value of the expression is $180$.