What are the foci of the hyperbola represented by the equation 5x2−7y2=1?Choose 1 answer:(A) (0,12) and (0,−12)(B) (12,0) and (−12,0)(C) (74,0) and (−74,0)(D) (0,74) and (0,−74)
Q. What are the foci of the hyperbola represented by the equation 5x2−7y2=1?Choose 1 answer:(A) (0,12) and (0,−12)(B) (12,0) and (−12,0)(C) (74,0) and (−74,0)(D) (0,74) and (0,−74)
Equation form of hyperbola: The given equation is in the form of a hyperbola with the equation (a2x2)−(b2y2)=1, where a2 is under the x2 term and b2 is under the y2 term. For a hyperbola of this form, the foci are located at (±c,0) if the x2 term is positive, and at (0,±c) if the y2 term is positive, where c is the distance from the center to each focus.
Identifying a2 and b2: We identify a2 and b2 from the given equation. Here, a2=5 and b2=7. The next step is to find the value of c, which is calculated using the formula c2=a2+b2 for hyperbolas.
Calculating the value of c: We calculate c2 using the values of a2 and b2: c2=5+7=12. Therefore, c=12.
Locating the foci: Since the x2 term is positive and comes first in the equation, the foci are located along the x-axis. Thus, the coordinates of the foci are (±12,0).
Matching the result with choices: We match our result with the given choices. The correct choice is (B) (12,0) and (−12,0).