Write the value of the expressions when $a = 1, b = 3$ and $c = 3 .$
$4 a^{2} - 3 b^{2}$

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Solution

We can write the given algebraic expression as :
$4 a^{2} - 3 b^{2} = 4 \times a \times a - 3 \times b \times b = 4 \times 1 \times 1 - 3 \times 3 \times 3 (Substituting a = 1 and b = 3) = 4 - 27 = - 23$
So , the value of given algebraic expression is $- 23$

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