In surd form, square roots need to be have the same radical term before you can add or subtract them.
However, unlike in algebraic expressions, it is possible to add or subtract square roots using approximate (decimal) values.
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The first step, in solving a quadratic equation in a variable x using this method, is to complete the square defined by the terms in x2 and x, by adding and subtracting a suitable constant.
hexagon
-31
16 - 9 = 7.
In a square with 25 smaller squares arranged in a 5x5 grid, there are a total of 55 squares. This includes the 25 individual smaller squares, the 16 squares formed by combining 4 smaller squares, the 9 squares formed by combining 9 smaller squares, the 4 squares formed by combining 16 smaller squares, and the 1 square formed by combining all 25 smaller squares.