- #1
lionely
- 576
- 2
A point P whose x-coordinates is a is taken on the line y=3x-7. If Q is the point(4,1)
show that PQ2 = 10a2-56a+80. Find the value of a which will
make the expression a minimum. Hence show that the coordinates of N, the foot of the perpendicular from Q to the line are (24/5 , 1 2/5). Find the equation of QN.
I'm having trouble with the first part
isn't P {a, (3a-7)} and Q2 ( 16,1)?
show that PQ2 = 10a2-56a+80. Find the value of a which will
make the expression a minimum. Hence show that the coordinates of N, the foot of the perpendicular from Q to the line are (24/5 , 1 2/5). Find the equation of QN.
I'm having trouble with the first part
isn't P {a, (3a-7)} and Q2 ( 16,1)?