Question

if a + b + C is equal to 7 and a b + BC + CA is equal to 20 find the value of a square + b square + c square​

Answer 1

Answer:

a^2+b^2+c^2=9

Step-by-step explanation:

1 and 2 line mai = ke baad 49 h

Answer 2

Answer:

✨ using

$(a + b + c) {}^{2} \: formula \: \: (a + b + c) {}^{2} = a {}^{2} + b {?}^{2} + c {}^{2} + 2b + 2bc + 2ac \: \: (a + b + c) {}^{2} - 2ab - 2bc - 2ac = a {}^{2} + b {}^{2} + c {}^{2} \: \: (7) {}^{2} - 2 \: (ab + bc + ac) = a {}^{2} + b {}^{2} + c {}^{2} \: \: 49 - 2(20) = a {}^{2} +b {}^{2} + c {}^{2} \: \: therfor \: a {}^{2} + b {}^{2} + c {}^{2} = 9$