Question

Rowena then walks 3 km at an average speed of (x – 1) km/h.
The total time taken to walk the 5 km is 2 hours.
(a) Show that 2x2-7x+2 = 0. [3]

Answer 1

Answer:

Answer:

2*2-7x+2=0

4+2-7x=0

6-7x=0

-7x=0-6

x=-6+7

x=1

Step-by-step explanation:

Answer 2

Answer:

7 +- √33 /4

Step-by-step explanation:

Quadratic formula:

x= -b +- √b^2 -4ac / 2a

a=2, b= -7, c=2

x= -(-7) +- √-7^2 -4(2)(2)/2(2)

x= 7 +- √49 -16/4

x= 7 +- √33/4

x= 7 + √33/4 x= 7-√33/4