If the side length of a square increases by 4 cm, the area also increases by 40 cm2. What is the area of the enlarged square?
一个正方形的边长增加4厘米，面积也增加了40平方厘米，问扩大后的正方形面积为多少平方厘米．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">40 - 16</gadget>
<output>24</output>

<gadget id="calculator">24 / 2 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 + 40</gadget>
<output>49</output>

<result>49</result>