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problem using regression

I can prove this problem using regression, but I don't have an equation for it. Please help, thanks!

a.) Suppose you multiply all X1 values by 2 in an equation with one independent variable (X1) and a constant. What will be the effect of this rescaling, if any, on the coefficients (SYMBOL1 and SYMBOL2) and their standard errors? Prove your answer mathematically (You are not supposed to use run/calculate a regression as a proof).

*(Please see attachment for proper symbols)

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Prove your answer mathematically (You are not supposed to use run/calculate a regression as a proof).

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