Please explain Q If a2 + b2 + c2 = 16, x2 + y2 + z2 = 25 - Maths - Lines and Angles

Question

Please explain

Q If a2 + b2 + c2 = 16,
x2 + y2 + z2 = 25 and ax + by + cz
= 20, then the value of a + b + c x + y + z
A   3 5              
                 
                 
                 
                 
        B   4 5 C   5 3    
                 
                 
                 
                 
                  D
  5 4

Brijendra Pal · Accepted Answer

<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5acefdd645fd2%20png"
style="width: 518px; height: 513px;">
We are neglecting negative value of k , -4/5 from start because
option has no negative values

Please explain Q. If a2 + b2 + c2 = 16, x2 + y2 + z2 = 25 and ax + by + cz = 20, then the value of a + b + c x + y + z A 3 5 B 4 5 C 5 3 D 5 4

Please explain

Q. If a² + b² + c² = 16, x² + y² + z² = 25 and ax + by + cz = 20, then the value of $\frac{a + b + c}{x + y + z}$
$(A) \frac{3}{5} (B) \frac{4}{5} (C) \frac{5}{3} (D) \frac{5}{4}$