Please solve question no.3.

Dear student
Distance between two points (x1,y1) ( x2,y2) is :=(x2-x1)2+y2-y12Here x1=-3 and y1=-14x2=a and y2=-5So, we have(a+3)2+-5+142=9Squaring both sides we get(a+3)2+92=81(a+3)2=0a+3=0a=-3
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