The function can be solved as follows:
(h - g)(2.1) = 3.51
g(x) = 2x² + 3x - 9
h(x) = x² + 2x - 6
(h - g)(x) = h(x) - g(x)
(h - g)(x) = 2x² + 3x - 9 - ( x² + 2x - 6)
(h - g)(x) = 2x² + 3x - 9 - x² - 2x + 6
(h - g)(x) = 2x² - x² + 3x - 2x - 9 + 6
(h - g)(x) = x² + x - 3
Therefore,
(h - g)(2.1) = (2.1)² + (2.1) - 3
(h - g)(2.1) = 4.41 + 2.1 - 3
(h - g)(2.1) = 6.51 - 3
(h - g)(2.1) = 3.51
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