Discussion
The value of x² - 5 at x= -1 is -
Answer: C
Substitute \( x = -1 \), squaring before subtracting.
\[ x^{2} - 5 = (-1)^{2} - 5 = 1 - 5 = -4 \]
A negative number squared is positive, so \( (-1)^{2} = 1 \), not \( -1 \) - that slip would give \( -6 \).
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