Question

If k-p²=(9+p)×(9-p), find k
a)81
b)18
c)-18
d)-81​

Answer 1

Answer:

• a) 81

Given:

• k - p² = (9 + p) × (9 - p)

To find:

• The value of k.

Solution:

》k - p² = (9 + p) × (9 - p)

》k - p² = 9² - p²

By identity (a + b) (a - b) = a² - b²

》k = 9²

》k = 81

Therefore, the value of k is 81.

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Extra information:

• (a + b)² = (a - b)² + 4ab

• (a - b)² = (a + b)² - 4ab

• a² + b² = (a + b)² - 2ab

• a² + b² = (a - b)² + 2ab

Answer 2

Answer:

9

Step-by-step explanation:

use distributive property

so, answer will be 9