Question

Use suitable identity to find the product of (7 – 2y) (7 +2y).

Answer 1

`\tt (7 - 2y) (7 +2y)`

By using identinty :

`\large \underline{\boxed{\bf{(a-b)(a+b) = a^2 - b^2}}}`

`\tt : \implies (7 - 2y) (7 +2y) = (7)^(2) - (2y)^(2)`

`\tt : \implies (7 - 2y) (7 +2y) = 49 - 4y^(2)`

`\large \underline{\boxed{\bf{(7 - 2y) (7 +2y) = 49 - 4y^(2)}}}`

Hence, value of (7 - 2y) (7 +2y) is 49 - 4y².