If $$ f(x)=-2[x]+8 $$, what is $$ f(-1.8) ? $$ 4 6 10 12

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UpStudy AI · Accepted Answer

To evaluate $$ f(-1.8) $$ for the function $$ f(x) = -2[x] + 8 $$, we need to determine the value of $$[x]$$. Here, $$[x]$$ typically represents the **floor function**, which returns the greatest integer less than or equal to $$ x $$.

1. **Calculate $$[ -1.8 ]$$:**
   $$
   [ -1.8 ] = -2
   $$
   The floor of $$-1.8$$ is $$-2$$ because $$-2$$ is the greatest integer less than $$-1.8$$.

2. **Substitute into the function $$ f(x) $$:**
   $$
   f(-1.8) = -2[-1.8] + 8 = -2(-2) + 8 = 4 + 8 = 12
   $$

**Answer:** 12
$$ f(-1.8) = 12 $$

If , what is
4
6
10
12

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