Question

if a+b+c=15 and a^2+b^2+c^2 =52 then find the value of ab+bc+ca​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

$a + b + c = 15$

SQUARING ON BOTH SIDES

${(a + b + c)}^{2} = 225$

${a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ca) = 225$

${a}^{2} + {b}^{2} + c^{2} = 225 - 104$

${a}^{2} + b^{2} + {c}^{2} = 121$

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