An engineer standing on top of a building 15m high looks at his co-worker sitting some distance from the bottom of the building. If the distance between the engineer and his co-worker is 35, what is the distance between the engineer's co-worker and the foot of the building?​

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this

there are no multiple choices