Question

find the value of ab+bc+ac if a+b+c=9 and a^2+b^2+c^2=35 pls help me for finding this answer begging pls

Answer 1

Answer:

23

Step-by-step explanation:

Given: a + b + c = 9

On Squaring both sides, we get

⇒ (a + b + c)² = 9²

⇒ a² + b² + c² + 2(ab + bc + ca) = 81

⇒ 35 + 2(ab + bc + ca) = 81

⇒ 2(ab + bc + ca) = 81 - 35

⇒ 2(ab + bc + ca) = 46

⇒ ab + bc + ca = 23

Hope it helps!

Answer 2

Answer:

Step-by-step explanation:

we are given a+b+c=9

squaring both sides,

then we get,  a^2+b^2+c^2+2ab+2ac+2bc=81

35+2(ab+bc+ca)=81

2(ab+bc+ca)=46

ab+bc+ca=23

and here's your answer