Question

(v) simplify (7x + 9)2 – (7x – 9)2 in detail​

Answer 1

Answer:

36

Step-by-step explanation:

14x+18-14x+18

14x-14x+18+18

=36

Answer 2

Answer:

252x

Step-by-step explanation:

Using identity

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

Therefore

${(7x + 9)}^{2} - {(7x - 9)}^{2}$

$= (7x + 9 + 7x - 9)(7x + 9 - 7x + 9)$

$= 14x(18)$

$= 252x$

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