Question

please help this... ​

Answer 1

Answer:

first of all , you should be knowing the concept of componendo - dividendo .

according to this rule

if a/b and c/d are two ratios then,

$\frac{a + b}{a - b} = \frac{c + d}{c - d}$

this I have used in the solution of that question.

Step-by-step explanation:

other formula used:

• (a+ b)² + ( a - b)² = 2(a² + b²)

. (a + b)² -( a - b)² = 4ab

i Hope it will help u .