k(k + 5)
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5000
7k^(2) + 7k - 140 Factor out '7' Hence 7(k^(2) + k - 20) Factor inside the brackets 7(k + 5)(k - 4) Done!!!!
20% means 20/100 Hence its reciprocal is 100/20 = 10/2 = 5
2k = 5k-30 Subtract 5k from both sides: -3k = -30 Divide both sides by -3 to find the value of k remembering that a minus divided into a minus becomes a plus: k = 10
5 thousand dollars. K=1,000