Question

Change q9 and q10

9. Simplify (a-b+c)(a-b-c)​

Answer 1

Answer:

(a−b+c)(a−b−c)​

=a²+a(−b)+a(−c)+(−b)a+(−b)²+(−b)(−c)+ca+c(−b)+c(−c)

+(−a)=−a,  (−a)(−b)=ab

=a²−ab−ac−ab+b²+bc+ac−bc−c²

= −2ab+a²+b²−c²

Answer 2

Step-by-step explanation:

An image is formed on the retina with light rays converging most at the cornea and upon entering and exiting the lens. Rays from the top and bottom of the object are traced and produce an inverted real image on the retina. The distance to the object is drawn smaller than scale.