Question

which book is these questions? if one zero of the polynomial is 5x2+13x-k is the reciprocal of the other then find k at what point does the line 4x+5y=20 intersect x-axis​

Answer 1

Answer:

k= -5and this line intersects at (5,0)

Step-by-step explanation:

see bro, let the roots be a and 1/a

then a+1/a= -13/5

and a×1/a=-k/5

so -k/5= 1

then k=-5

2)

if the line intersects x axis then at the intersection point the y coordinate must be 0

so putting y=0 in the equation we get

4x + 5×0 = 20

4x = 20 or x=20/4

x=5