Answer
$W=\frac{1}{2}(K_1+K_2)x^2$
Work Step by Step
We can find the required work done as
$W=W_1+W_2$
$\implies W=\frac{1}{2}K_1x^2+\frac{1}{2}K_2x^2$
$\implies W=\frac{1}{2}(K_1+K_2)x^2$
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