Question

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Answer 1

Answer:

a^2 + b^2 + c^2 = 25.

Step-by-step explanation:

Solution:

Step 1 - Squaring both the sides of Equation 1, we get -

(a + b + c)^2 = a^2 + b^2 + c^2 + 2*(a*b + b*c + c*a) = 7^2 = 49

Thus, a^2 + b^2 + c^2 + 2*(a*b + b*c + c*a) = 49

Step 2 - Using Equation 2 in the above equation to replace “ab + bc + ca”, we get -

a^2 + b^2 + c^2 + 2*(a*b + b*c + c*a) = a^2 + b^2 + c^2 + 2*(12) = 49

This implies, a^2 + b^2 + c^2 = 49 - 2*12 = 49 - 24 = 25

Answer 2

Answer:

okay

Step-by-step explanation:

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