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Q9. Expand using brackets and solve 17×109

Answer»

Answer:

⇒1 7 × 109

=(20-3)× (100 +9)

We will use FOLLOWING Identity

(x+a)(x+b)=x²+(a+b)x+ab

=20×(100 +9) -3×(100+9)

=20×100 +20×9 -3×100-3×9

=2000+180-300-27

=2180 -327

= 1853



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