Question

Factorise (apply identities formula only) x²-16​

Answer 1

Answer:

• 16 can be written as (4)²
• By using formula (a-b)² ⇒ a² + b² - 2ab
• Here a = x and b = 4
• Substitute the values
• (x - 4)² = x² + 16 - 8x

• x² - 8x + 16
• x² -4x - 4x + 16 = 0
• x ( x - 4) - 4 (x - 4 ) = 0
• (x - 4) (x - 4) = 0
• x = 4 or x = 4

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You

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Answer 2

Answer:

Solution :-

➜ x² - 16

➞ (x)² - (4)²

➜ (x + 4) (x - 4)

∴ The answer of this question is

(x + 4) (x - 4)

Formula used :-

➜ a² - b²

➞ (a + b) (a - b)