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(m + 7n) (m + 7n)
m² + 7mn + 7mn + 49n²
m² + 14mn + 49n²
4. 16s² + 24st + 9t²
(4s + 3t) (4s + 3t)
16s² + 12ts + 12ts + 9t²
16s² + 24ts + 9t²
5. 16y² - 56yz + 49z²
(4y - 7z) (4y - 7z)
16y² - 28yz - 28yz + 49z²
16y² - 56yz + 49z²