Question

The cordinates of a A are (-4,8) and those of B are (x, 3).Find x if AB=13.​

Answer 1

Answer:

13×13=(x+4)(x+4)+(3-8)^2

169=x^2+16+8x+25

169=x^2+8x+41

x^2+8x-128=0

x^2+16x-8x-128=0

x(x+16)-8(x+16)=0

(x+16)(x-8)=0

x= -16 or x=8