Question

$subtraed \: { - m}^{2} + 5mn \: from \: {4m}^{2} \: - mn \: + 8$
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Answer 1

$\\ (4 {m}^{2} - mn + 8) \\ - ( { - m}^{2} + 5mn) \\ \\ = 4 {m}^{2} - mn + 8 + {m}^{2} - 5mn \\ \\ = 5 {m}^{2} - 6mn + 8$