Question

factories by using identity A²-B²=(A+B)(A-B) 20z²-5y²​

Answer 1

Answer:

$( \sqrt{20} z \: + \sqrt{5} y)( \sqrt{20} z \: - \sqrt{5} y)$

$= ( 2\sqrt{5} z \: + \sqrt{5} y)( 2\sqrt{5} z \: - \sqrt{5} y)$

$\sqrt{5} ( 2z + y)( 2z - y)$

Answer 2

Answer:

Your answer is, ( 5 ) ( 2z + y ) ( 2z - y ).

Step-by-step explanation:

 20z² - 5y²

⇒ 5( 4z² - y²)

⇒ 5( 2z + y ) ( 2z - y ) [ ∵ using the identity: a² - b² = ( a + b ) ( a - b ) ]

⇒ ( 5 ) ( 2z + y ) ( 2z - y )

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