Question

please solve the 99and 100 questions​

Answer 1

Answer:

Step-by-step explanation:

Q.99 Reciprocal in numerator and using identity in denominator

⇒[ [1 - (b²/a² ] a²] / [ a + b] = 1

⇒[[(a² - b²)/a²]a²] / [ a + b] = 1

⇒[a² - b²] / [ a + b] = 1

⇒ (a - b) (a + b) / (a + b) = 1 ⇒ (a - b) * 5 / 5 = 1

⇒ (a - b) = 1 option a is correct

Q.100

if x + y + z = 0

⇒ √7 - √5 + √5 - √3 + √3 - √7 = 0

then x³ + y³ + z³ = 3xyz

hence x³ + y³ + z³ - 3xyz = 0

option c is correct