If f(x) = 3x, what is f(4)?
1 answer:
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Answer:
The circle is of radius and is centered at
.
Step-by-step explanation:
Equation for a circle of radius (
) and center
:
.
Expand and rearrange to obtain an equivalent equation:
.
.
Compare this equation with the equation of the circle in this question:
- Coefficient of the
term:
in the original equation,
in the proposed equation.
- Coefficient of the
term:
in the original equation,
in the proposed equation.
- Constant term:
in the original equation,
in the proposed equation.
Assume that the proposed equation matches the equation from the question. Each of the coefficients should match.
From the coefficient of the term and the
term:
and
.
Hence, the center of this circle is at .
The constant term of the two equations should also match: .
.
.
(given that radius
.)
Hence, the radius of this circle would be .