Question

8.If a+b+c = 9, ab+bc+ca=26 find the value of a^2+b^2+c^2

Answer 1

Answer:

29

Step-by-step explanation:

$(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)\\\\\\9^2=a^2+b^2+c^2+2(26)\\\\\\81-52=a^2+b^2+c^2\\\\\\29=a^2+b^2+c^2$