Just differentiate G and H :
• dG/dx = d(x ² eˣ )/dx = 2x eˣ + x ² eˣ
so G is not an antiderivative of f.
• dH/dx = d(2x eˣ - 2eˣ ) = (2eˣ + 2x eˣ ) - 2eˣ = 2x eˣ = f(x)
so H is indeed an antiderivative of f.
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