Find the standard form of the equation of the ellipse with the given characteristics and center at the origin. Foci: (±7, 0); major axis of length 18

Step-by-step explanation:

The standard form of equation of ellipse with foci (±c,0) as:

, where major axis = 2a and minor axis = 2b

Given: Foci: (±7, 0); major axis of length 18

i.e. c= 7 and 2a =18 ⇒a= 9

Also,

Put value of and , we get the required equation :

i'm sorry i don't know

step-by-step explanation:

m∠a is 90°

m∠b is 40°