Question

if a+b+c=9 and ab+bc+ca=26 find=a²+b²+c²​

Answer 1

Answer:

$a {}^{2} + b {}^{2} + c {}^{2} + 2(ab + bc + ac) = (a + b + c) {}^{2} \\ a {}^{2} + b {}^{2} + c {}^{2} = (a + b + c) {}^{2} - 2(ab + bc + ac) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 9 {}^{2} - 2 \times 26 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 81 - 52 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 29$

Answer 2

Step-by-step explanation:

refer the attachment for your answer.....