Answers

2016-02-25T22:45:41+05:30
By distant formula
√[-1-(-5)]²+[-4-(-7)]²
√(-1+5)² +(-4+7)²
=√(4)²+(3)²
=√16+9
=√25
+5 unit

2nd part
√[-2-7]²+[-6-(-3)]²
⇒√(-9)²+(-6+3)²
⇒√81+9
⇒√90
⇒3√10unit
1 5 1