Questions: Evaluate 8x^2+2x+5, when x=7.

Transcript text: Evaluate $8 x^{2}+2 x+5$, when $x=7$.

Solution

To evaluate the expression $8x^2 + 2x + 5$ when $x = 7$, substitute 7 for $x$ in the expression and compute the result.

Step 1: Substitute $x = 7$ into the Expression

To evaluate the expression $8x^2 + 2x + 5$ at $x = 7$, substitute 7 for $x$:

\[ 8(7)^2 + 2(7) + 5 \]

Step 2: Calculate Each Term

Calculate each term separately:

Step 3: Sum the Terms

Add the results from each term:

\[ 392 + 14 + 5 = 411 \]

The value of the expression when $x = 7$ is $\boxed{411}$.

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