Question

use the identity to find
$(25 + 4)(25 - 5)$
​

Answer 1

Given,

=(25+4)(25-5)

=25(25-5)+4(25-5)

=625-125+100-20

=580

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Answer 2

Answer: Using the identity,

(a^2-b^2) = (a+b)(a-b)

(25+4)(25-4) = (25)^2-(4)^2

= 625-16

= 609