Evaluate Expression Ddbec7
1. The problem is to evaluate the expression $5(9^2 - 7^2) - 35$ and determine which given statements about it are correct.
2. Recall the order of operations: first evaluate exponents, then parentheses, then multiplication, and finally subtraction.
3. Calculate the squares inside the parentheses:
$$9^2 = 81$$
$$7^2 = 49$$
4. Substitute these values back into the expression inside the parentheses:
$$9^2 - 7^2 = 81 - 49 = 32$$
5. Multiply by 5:
$$5(32) = 160$$
6. Now subtract 35:
$$160 - 35 = 125$$
7. Check each statement:
- A: $5(9^2 - 7^2) = 20$ is incorrect because $5(32) = 160$, not 20.
- B: $5(9^2 - 7^2) = 5(32)$ is correct as shown in step 4.
- C: $5(9^2 - 7^2) = 160$ is correct as shown in step 5.
- D: $5(9^2 - 7^2) - 35 = -15$ is incorrect because the result is 125, not -15.
- E: $5(9^2 - 7^2) - 35 = 125$ is correct as shown in step 6.
Final answer: Statements B, C, and E are correct.