Question 175
By what number should (−15)−1 be divided so that the quotient may be equal to (−5)−1 ?
Let x be the number divide (−15)−1 to get (−5)−1 as a quotient. So, (−15)−1÷x=(−5)−1⇒1−15×1x=1−5 [∵a−m=1am]⇒1x=1−5×−151⇒x=3
Question 103
By what number should (−15)−1 be divided so that quotient may be equal to (−15)−1?
Question 68
By what number should (−4)5 be divided so that the quotient may be equal to (−4)3?