An algebra problem by david zhang

Algebra Level 1

19 * 1818-18 * 1918=


The answer is 18.

David Zhang by david zhang , 20, China

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4 solutions

Omkar Kulkarni
Feb 4, 2015

19 × 1818 − 18 × 1918 19\times 1818 - 18 \times 1918

( 18 + 1 ) × 1818 − 18 × ( 1818 + 100 ) (18+1)\times1818-18\times(1818+100)

= 18 × 1818 + 1 × 1818 − 18 × 1818 − 18 × 100 = 18\times 1818 + 1\times 1818 - 18 \times 1818 - 18 \times 100

= 1818 − 1800 = 18 = 1818-1800 = \boxed{18}

3 Helpful 0 Interesting 0 Brilliant 0 Confused
Mohammad Khaza
Jul 9, 2017

19 × 1818 − 18 × 1918 19 \times 1818 - 18 \times 1918

= ( 18 + 1 ) × 1818 (18 +1) \times1818 - ( 1818 + 100 ) × 18 (1818 +100) \times 18

= 1818 − 1800 1818 -1800

= 18 18

1 Helpful 0 Interesting 0 Brilliant 0 Confused

19 ( 1818 ) − ( 18 ) ( 1918 ) = 18 19(1818)-(18)(1918)=18

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Halima Tahmina
Jul 9, 2017

19 x1818 -18 x 1918 =18

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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