bilal59 bilal59

15-09-2020
Mathematics

contestada

If a+b+c=9 ab +bc+ca=12 find a2+b2+c2

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ChoiSungHyun ChoiSungHyun

15-09-2020

Step-by-step explanation:

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

Therefore 9^2 = (a^2 + b^2 + c^2) + 2(12).

a^2 + b^2 + c^2 = 81 - 24 = 57.

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Аноним Аноним

08-09-2021

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