4)) Find the equation of the parabola with focus \( ( - 4,0 ) \) and directrix \( x = 4 \) .
A) \( x ^ { 2 } = 16 y \)
B) \( y ^ { 2 } = 16 x \)
C) \( x ^ { 2 } = - 16 y \)
D) \( y ^ { 2 } = - 16 x\)
Pregunta
Answer
\(x = - \frac { y ^ { 2 } } { 16 }\)
D) \( y ^ { 2 } = - 16 x\)
Related Questions
Q:
Find the solution of the exponential equation \( 16 e ^ { x } = 12 \) in terms of logarithms, or correct to four decimal places. \( x = \)
Q:
Certain radioactive material decays in such a way that the mass remaining after \( t \) years is given by the function
\( m ( t ) = 100 e ^ { - 0.01 t } \)
where \( m ( t ) \) is measured in grams. (a) Find the mass at time \( t = 0 \) . Your answer is (b) How much of the mass remains after \( 20 \) years? Your answer is Round answers to \( 1 \) decimal place.