Exercise 1.2.4

Perform the indicated operations.

(a)

$\left(\begin{array}{ccc}\hfill 2& \hfill 5& \hfill -3\\ \hfill 1& \hfill 0& \hfill 7\end{array}\right)+\left(\begin{array}{ccc}\hfill 4& \hfill -2& \hfill 5\\ \hfill -5& \hfill 3& \hfill 2\end{array}\right)$

(b)

$\left(\begin{array}{cc}\hfill -6& \hfill 4\\ \hfill 3& \hfill -2\\ \hfill 1& \hfill 8\end{array}\right)+\left(\begin{array}{cc}\hfill 7& \hfill -5\\ \hfill 0& \hfill -3\\ \hfill 2& \hfill 0\end{array}\right)$

(c)

$4\left(\begin{array}{ccc}\hfill 2& \hfill 5& \hfill -3\\ \hfill 1& \hfill 0& \hfill 7\end{array}\right)$

(d)

$-5\left(\begin{array}{cc}\hfill -6& \hfill 4\\ \hfill 3& \hfill -2\\ \hfill 1& \hfill 8\end{array}\right)$

(e)

$\left(2x^4-7x^3+4x+3\right)+\left(8x^3+2x^2-6x+7\right)$

(f)

$\left(-3x^3+7x^2+8x-6\right)+\left(2x^3-8x+10\right)$

(g)

$5\left(2x^7-6x^4+8x^2-3x\right)$

(h)

$3\left(x^5-2x^3+4x+2\right)$