Find a² + b²

Question:

If \[ a+b=7 \] and \[ ab=12 \] find:

\[ a^2+b^2 \]

Solution:

Using identity:

\[ (a+b)^2 = a^2+b^2+2ab \]

Substituting the given values:

\[ (7)^2 = a^2+b^2+2(12) \]

\[ 49 = a^2+b^2+24 \]

\[ a^2+b^2 = 49-24 \]

\[ =25 \]

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