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To find the area of the sandbox, we need to multiply the length (G(x)) by the width (H(x)).
The length is (2x + 5) and the width is (x - 4), so the area (A) is:
A = (2x + 5)(x - 4)
Now we can distribute:
A = 2x * x + 2x * (-4) + 5 * x + 5 * (-4)
A = 2x^2 - 8x + 5x - 20
A = 2x^2 - 3x - 20
So, the area of the sandbox is 2x^2 - 3x - 20.