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Source: — Data Sufficiency |
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by Matt@VeritasPrep » Fri Sep 25, 2015 11:03 am
Since p ≠ 0 (otherwise we couldn't divide by p), we can multiply the entire equation by p, giving

Is a(p² + r² + s²) = ap² + brp + csp ?

or

Is ap² + ar² + as² = ap² + brp + csp ?

or

Is ar² + as² = brp + csp ?


S1 tells us that cp = as, which means that the RED terms are equal.

S2 tells us that ar = bp, which means that the BLUE terms are equal.

And from there we're good to go!
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