Question

if a+b+c=7,ab+bc+ca=20, find the value of a square+b square+c square

Answer 1

Step-by-step explanation:

(a+b+c)^2=a^2+b^2+c^2+2(ab+ac+BC)

7^2-40

9

Answer 2

Answer:

9

Step-by-step explanation:

(a+b+c)^2=a square + b square + c square + 2( ab + bc + ca)

(7)^2=a square + b square + c square + 2(20)

49-40=a square + b square + c square

a square + b square + c square=9