Question

Evaluate 68²-42²
$\frac{ {68}^{2} - {42}^{2} }{26}$
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Answer 1

Answer:

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Answer 2

Answer:

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Step-by-step explanation:

We know the algebraic identity:

x² - y² = ( x + y )( x - y )

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Here ,

x = 68 , y = 42

( 68² - 42² ) /26²

=[ (68 + 42)(68 - 42)] / 26²

= ( 110 × 26 ) / ( 26 × 26 )

= 110 / 26

= ( 2 × 55 ) / ( 2 × 13 )

= 55/13