Question

please answer fast
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ans if u r sure​

Answer 1

Answer:

b. 16

Step-by-step explanation:

i hope it is useful

Answer 2

Given :-

• x - 1/x = 4

To find :-

• x² + 1/x²

Solution :-

• x - 1/x = 4

Squaring both side

→ (x - 1/x)² = (4)²

• Apply identity
• (a - b)² = a² + b² - 2ab

→ (x)² + (1/x)² - 2 × x × 1/x = 16

→ x² + 1/x² - 2 = 16

→ x² + 1/x² = 16 - 2

→ x² + 1/x² = 14

Hence,

• The value of x² + 1/x² is 14

Some more identities :-

• (a + b)³ = a³ + b³ + 3ab(a + b)

• (a - b)³ = a³ - b³ - 3ab(a - b)

• a³ - b³ = (a - b)(a² + ab + b²)

• a³ + b³ = (a + b)(a² - ab + b²)