Q104 of 196 Page 249

Find the multiplicative inverse of (–7)–2 ÷ (90)–1.

Remember, a is called multiplicative inverse of b, if a × b = 1.


∴ (–7)–2 ÷ (90)–1 =


=


=


∵ (-a)m = am , if m is an even number and (-a)m =


Put b = in a × b = 1


a × = 1


∴


∴ The multiplicative inverse of (–7)–2 ÷ (90)–1 is


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