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The value of x²-3x when x = 5 is 10.

To find the value of x²-3x when x = 5, we substitute 5 into the expression: (5)² - 3(5) = 25 - 15 = 10. Thus, the answer is 10.

A) 2

Option A is incorrect because substituting x = 5 into the expression results in 10, not 2. The calculation clearly shows that 25 - 15 equals 10.

B) 5

Option B is incorrect as well. The expression evaluates to 10 when x = 5, so claiming that it equals 5 misrepresents the outcome of the calculation.

C) 10

Option C is correct because substituting 5 into the expression x²-3x yields 10. The calculation shows that 25 - 15 indeed equals 10, confirming this option.

D) 15

Option D is incorrect since substituting x = 5 results in 10, not 15. The arithmetic demonstrates that 25 minus 15 does not equal 15.

Conclusion

The correct answer is 10, as derived from the expression x²-3x when x equals 5. All other options fail because they do not accurately reflect the result of the calculation, which is definitively 10.