Question

If
2+15
2-15
= x and
2 - 5
2 + 15
= y; find the
value of x2 - y2.​

Answer 1

The sign of power depends on the direction in which a light ray is deviated by the lens. The power could be positive or negative. If a lens deviates a ray towards its centre (converges), the power is positive and if it deviates the ray away from its centre (diverges), the power is negative.

Answer 2

Answer:

46240

Explanation:

(2+15)(2-15)=x

(2-5)(2+15)=y

2^2-15^2=x

4-30-10-75=y

-221=x

-51=y

x^2-y^2=(-221)^2-(-51)^2

x^2-y^2=48841-2601

x^2-y^2=46240