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Which point is on the graph of [tex]f(x) = 2 \cdot 5^x[/tex]?

A. [tex](10,1)[/tex]
B. [tex](0,0)[/tex]
C. [tex](1,10)[/tex]
D. [tex](0,10)[/tex]


Sagot :

To determine which point is on the graph of the function [tex]\( f(x) = 2 \cdot 5^x \)[/tex], we need to evaluate [tex]\(f(x)\)[/tex] at the given x-values and check which corresponding y-value matches the provided points.

Let's analyze each option step-by-step:

1. Option A: (10, 1)
- Evaluate [tex]\(f(10)\)[/tex]:
[tex]\[ f(10) = 2 \cdot 5^{10} \][/tex]
- Calculate [tex]\(5^{10}\)[/tex]:
[tex]\[ 5^{10} = 9765625 \][/tex]
- Thus:
[tex]\[ f(10) = 2 \cdot 9765625 = 19531250 \][/tex]
- Compare with y-coordinate 1:
[tex]\[ 19531250 \neq 1 \][/tex]
- This point is not on the graph.

2. Option B: (0, 0)
- Evaluate [tex]\(f(0)\)[/tex]:
[tex]\[ f(0) = 2 \cdot 5^0 = 2 \cdot 1 = 2 \][/tex]
- Compare with y-coordinate 0:
[tex]\[ 2 \neq 0 \][/tex]
- This point is not on the graph.

3. Option C: (1, 10)
- Evaluate [tex]\(f(1)\)[/tex]:
[tex]\[ f(1) = 2 \cdot 5^1 = 2 \cdot 5 = 10 \][/tex]
- Compare with y-coordinate 10:
[tex]\[ 10 = 10 \][/tex]
- This point is on the graph.

4. Option D: (0, 10)
- Evaluate [tex]\(f(0)\)[/tex]:
[tex]\[ f(0) = 2 \cdot 5^0 = 2 \cdot 1 = 2 \][/tex]
- Compare with y-coordinate 10:
[tex]\[ 2 \neq 10 \][/tex]
- This point is not on the graph.

After evaluating all the points, we find that only Option C: (1, 10) is on the graph of the function [tex]\(f(x) = 2 \cdot 5^x\)[/tex].

Thus, the correct answer is:
C. (1, 10)