Question

Please help me with this question
​

Answer 1

answer-20

Step-by-step explanation:

ab + bc +ca =20

use (a+b+c)^2=a^2+ b^2 +c^2 + 2ab +2bc +2ca

on substituting the given values we get

2(ab+bc+ca)=40

hence we get the answer.

thanks

hope u understood

pls mark me brainliest

Answer 2

Answer:20

Step-by-step explanation:(a+b+c)^2 = a^2 + b^2 + c^2 + 2 ( ab + bc + ca )

consider ab + bc + ca = x

9 ^2 = 41 + 2 (x )

81 = 41 + 2x

81 - 41 = 2x

40 = 2x

x = 20

therefore ab+bc+ca = 20

hope it helps

pls pls pls mark as brainliest answer and

pls follow me on brainly

pls pls pls mark as brainliest answer