Question

Subtract the second expression from the first:

(i) 5x² $-$ 6xy + 2; 3x² + 10xy -8
(ii) m²n $-$ 8 + mn²; 7 $-$ m²n $-$ mn²
(iii) 5x² + 4y² $-$ 6y + 8; x² $-$ 5y² + 2xy + 3y $-$ 10

Answer 1

$$\begin{gathered} \left(\mathrm{i}\right) \\ 5x^2-6xy+2 \\ 3x^2+10xy-8 \\ \underline{--+} \\ 2x^2-16xy+10 \end{gathered}$$

$$\begin{gathered} \left(\mathrm{ii}\right) \\ {m}^{2}n-8+m{n}^2 \\ -m^{2}n+7-m{n}^2 \\ \underline{+-+} \\ 2m^{2}n-15+2m{n}^2 \end{gathered}$$

$$\begin{gathered} \left(\mathrm{iii}\right) \\ 5x^2+4y^2-6y+8 \\ {x}^2-5y^2+2xy+3y-10 \\ \underline{-+--}\underline{+} \\ 4x^2+9y^2-2xy-9y+18 \end{gathered}$$