7k^(2) + 7k - 140
Factor out '7'
Hence
7(k^(2) + k - 20)
Factor inside the brackets
7(k + 5)(k - 4)
Done!!!!
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-6K+7K=1K or K
-6k + 7k = k
k(7k + 9)
It simplifies to 7k = 49 which gives k = 7.
No because 0 is additive inverse the multiplicative inverse of a number is when you multiply that number by the m. inverse and still get that number.