Here is your answer
(a+b+c)^2= a2+b2+c2+ 2(ab+bc+ca)
(a+b+c)^2= 35 + 2×23= 35+46
(a+b+c)^2= 81= 9^2
(a+b+c) = 9
HOPE IT IS USEFUL
Answer:
a + b + c = 9
Step-by-step explanation:
Note that
(a + b + c)² = a² + b² + c² + 2(ab + bc + ca), hence
(a + b + c)² = 35 + 2(23) = 35 + 46 = 81
Take the square root of both sides
a + b + c = [tex]\sqrt{81}[/tex] = 9
