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ICSE Class 8 Answered

please solve this

1.(3-2-3-3) x (30+3-1)

  

Asked by avadhutpandav82.8spicertl | 27 May, 2020, 10:31: AM
Expert Answer
(3-2-3-3) x (30+3-1)
 
= 3-2 30  + 3-2 3-1  - 3-3 30  -  3-3 3-1
= 3-2 + 0 + 3-2+(-1) - 3-2+0 - 3-3+(-1)        ..... am × an = am+n
= 3-2  + 3-3 - 3-2- 3-4 
= 3-3 - 3-4
begin mathsize 16px style equals 1 over 3 cubed minus space 1 over 3 to the power of 4 space space space space space space space space space space...... since space straight a to the power of negative straight m end exponent space equals space fraction numerator 1 over denominator straight a to the power of straight m space end fraction equals 1 over 3 cubed open parentheses 1 minus 1 third close parentheses equals 1 over 3 cubed cross times 2 over 3 equals 2 over 3 to the power of 4 equals 2 over 81 end style
Answered by Yasmeen Khan | 27 May, 2020, 10:52: AM
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