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Prove that f(x) = 13x2 + 8x - 21 is a linear combination of g(x) = 2x2 + x - 3 and h(x) = -3x2

Prove that f(x) = 13x2 + 8x - 21 is a linear combination of g(x) = 2x2 + x - 3 and h(x) = -3x2 - 2x + 5. 13x2 + Box - 21 = (2x2 + x - 3) + ](-3x2 - 2x + 5)

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