The distance between P (a, 7) and Q (1, 3) is 5. The value of a is
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Answer:
a=-2 or 4
Step-by-step explanation:
√(a-1)²+(7-3)²=5
(a-1)²+(16)=25
a²+1-2a+16=25
a²-2a-8=0
a²-4a+2a-8=0
a(a-4)+2(a-4)=0
(a-4)(a+2)=0
a=4 or -2
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