Question

Using identity (x - a)(x + a) = x ^ 2 - a ^ 2 find 5² 4².​

Answer 1

Answer:

9

Step-by-step explanation:

Given, (5)^2 - 4^2

= (5-4)(5+4)

= 1×9

= 9 is the answer

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Answer 2

Answer:

The value of $(5^{2} -4^{2} )=9$  

Step-by-step explanation:

Given : $(x-a)(x+a) = x^{2} -a^{2}$

To find : By using above identity, find $5^{2} -4^{2}$

Solution :

• The given identity is  $(x-a)(x+a) = x^{2} -a^{2}$.
• We have to find the value of  $5^{2} -4^{2}$
• Here, $x=5$ and $a=4$.
• By using identity, we get

      $5^{2} -4^{2} =(5+4)(5-1)$

         $= 9*1$

         $= 9$

• ∴ The value of $(5^{2} -4^{2} )=9$