Questions: 8x + 7 - x^2 when x = 4

Transcript text: $8 x+7-x^{2} \quad$ when $x=4$

Solution

To solve the given expression $8x + 7 - x^2$ when $x = 4$, we need to substitute $x$ with 4 and then evaluate the expression.

Step 1: Substitute $ x = 4 $ into the Expression

Given the expression $ 8x + 7 - x^2 $, we substitute $ x = 4 $:

\[ 8(4) + 7 - (4)^2 \]

Step 2: Simplify the Expression

First, calculate $ 8 \times 4 $:

\[ 8 \times 4 = 32 \]

Next, calculate $ (4)^2 $:

\[ (4)^2 = 16 \]

Now, substitute these values back into the expression:

\[ 32 + 7 - 16 \]

Step 3: Perform the Arithmetic Operations

Add and subtract the values:

\[ 32 + 7 = 39 \]

\[ 39 - 16 = 23 \]

$\boxed{23}$

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