Question

r - 108 +21
${r}^{2} - 10r + 21$
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Answer 1

Answer:

$r { }^{2} - 10r + 21 \\ r { }^{2} - 7r - 3r + 21 \\ r(r - 7) - 3(r - 7) \\ (r - 7)(r - 3) = 0 \\ r - 7 = 0 \\ r = 7 \\ {} \\r - 3 = 0 \\ r = 3 \:$

Answer 2

Answer:

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