Question

7х в кводрате -8х +9 при х= 3

Answer 1

$7 \times {3}^{2} - 8 \times 3 + 9 = 63 - 24 + 9 = 48$

Answer 2

To find the value of the expression 7x^2 - 8x + 9 when x = 3, we simply substitute x with 3 and perform the calculation:

7(3)^2 - 8(3) + 9

Now, we'll perform the operations step by step:

7 * (3)^2 = 7 * 9 = 63 8 * 3 = 24

So, the expression becomes:

63 - 24 + 9

Now, we'll continue with the remaining operations:

63 - 24 + 9 = 39

Therefore, when x = 3, the expression 7x^2 - 8x + 9 evaluates to 39.