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Judith Bowman
Mathematics
8 January, 18:39
What makes this a perfect square K^2 - 30k + ?
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Jeramiah Price
8 January, 18:51
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225
Step-by-step explanation:
in (a+b) ^2, it becomes a^2+2ab+b^2. A in this case would be "K" and b in this case would be 15. K^2+2 (K) (15) + (15) ^2. That equals k^2+30k+225. The last part is 225.
My trick to do this quickly is you get the "2ab" part. You divide the coefficient by 2 and then square it. For example, the coefficient in 30K is 30. 30/2 is 15. 15^is 225.
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Hallie
8 January, 18:58
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225.
Step-by-step explanation:
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