Answered

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16. If [tex]$x=3$[/tex], evaluate the expression [tex]$x^2-1$[/tex].

A. -5
B. 5
C. -8
D. 8

Sagot :

GinnyAnswer
To evaluate the expression [tex]\( x^2 - 1 \)[/tex] when [tex]\( x = 3 \)[/tex], follow these steps:

1. Substitute the value of [tex]\( x \)[/tex] into the expression:
[tex]\[ x = 3 \][/tex]
So, we substitute 3 for [tex]\( x \)[/tex] in the expression [tex]\( x^2 - 1 \)[/tex].

2. Calculate [tex]\( x^2 \)[/tex]:
[tex]\[ x^2 = 3^2 = 9 \][/tex]
This gives us the square of 3, which is 9.

3. Subtract 1 from the result:
[tex]\[ 9 - 1 = 8 \][/tex]

So, the value of the expression [tex]\( x^2 - 1 \)[/tex] when [tex]\( x = 3 \)[/tex] is 8.

Therefore, the correct choice is:
D. 8
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