Question

Please answer these 3 questions..

Answer 1

Hey ,

your answer is ---

Given ,
${a}^{2} + {b}^{2} + {c}^{2} = 16$
and , ab + bc + ca = 10


now,

${(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ca)$
now put the given value , we get

${(a + b + c)}^{2} = 16 + 2 \times 10 \\ = 16 + 20 \\ = 36 \\ \\ a + b + c = \sqrt{36} = 6$




so , answer is 6


hope it help you