The distance between the points (2, 7) and (k, -5) is 13. what is the value of k?
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√[(2-k)²+(7+5)²] = 13
=>(2-k)²+144=169
=>(2-k)²=25
=>(2-k)=±5
=>k=2±5
so, k=7,-3
=>(2-k)²+144=169
=>(2-k)²=25
=>(2-k)=±5
=>k=2±5
so, k=7,-3
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