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If a+b+c=7& ab+bc+ca=22 find a2+b2+c2

Answer»

HEY BRO....

we KNOW that...

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

so...

{7}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(22)

49 - 44 = {a}^{2} + {b}^{2} + {c}^{2}

so A2+b2 + C2 =5

hope it helps

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