Question

use suitable identity to find the product of (7-2y) (7+2y) ​

Answer 1

Step-by-step explanation:

$(x - y)(x + y) = {x}^{2} - {y}^{2}$

so,

${7}^{2} - {(2y)}^{2} = 49 - 4 {y}^{2}$

answer : 49-4y²

Answer 2

$\sf{Answer}$

Step-by-step-explanation:-

We have to solve the question by using suitable identity

find the product of (7-2y) (7+2y)

It is in form of

( a + b) ( a - b) = a² - b²

By using this identity we can solve

So, product of ( 7-2y) ( 7 + 2y) = (7)² - (2y)²

( 7-2y) ( 7 + 2y) = (7)² - (2y)²

( 7-2y) ( 7 + 2y) = 49 - 4y²

So, the product of (7-2y) (7+2y) is 49-y²

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Know more identities:-

( a + b)² = a²+2ab + b²

( a - b)² = a² -2ab + b²

a² + b² = ( a + b)² -2ab

2a² + 2b² = ( a +b)² + ( a-b)²

a + b + c = 0 then a³ + b³ + c³ = 0

( a + b + c)² = a²+b²+c² + 2ab + 2bc + 2ca

( a + b)³ = a³ + b³ + 3ab ( a +b)

( a - b)³ = a³ - b³ -3ab ( a-b)