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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