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Please help, I'm just starting out in Linear Algebra and I'm not sure how to even start going about proving this. Thanks!

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- Thread starter drestupinblac
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Please help, I'm just starting out in Linear Algebra and I'm not sure how to even start going about proving this. Thanks!

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Mark44

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Welcome to Physics Forums!

Please help, I'm just starting out in Linear Algebra and I'm not sure how to even start going about proving this. Thanks!

If ax^2 + bx + c = 0 for all x, it's certainly true for, say, x = 0, x = 1, and x = -1. Substitute those values in your equation to get three equations in three unknowns, and solve for the three unknowns.

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