diketahui matriks A= [7 a -1] dan B=[7 2 -1] b 3 0 a-4 3 0 9 5 2 9 5 2 Jika A=B, nilai b adalah a.6 b.4 c.2 d.-2 e.-6

<p>Misalkan diketahui matriks A dan B berordo 3 × 3 ( mempunyai 3 baris dan 3 kolom), dengan:<br>A = [a &nbsp;b &nbsp;c]</p><p>......[d &nbsp;e &nbsp;f]</p><p>......[g &nbsp;h &nbsp;i]<br>B = [p &nbsp;q &nbsp;r]</p><p>......[s &nbsp;t &nbsp;u]</p><p>......[v &nbsp;w &nbsp;x]</p><p>Jika A = B, maka a = p, b = q, c = r, d = s, e = t, f = u, g = v, h = w, dan i = x.<br>&nbsp;</p><p>Maka,</p><p>A = B</p><p>[7 &nbsp;a &nbsp;-1] = [7 &nbsp;2 &nbsp;-1]</p><p>[b &nbsp;3 &nbsp;0] ** [a-4 &nbsp;3 &nbsp;0]</p><p>[9 &nbsp;5 &nbsp;2] ** [9 &nbsp;5 &nbsp;2]</p><p>&nbsp;</p><p>Sehingga diperoleh:</p><p>a = 2</p><p>&nbsp;</p><p>b = a - 4</p><p>b = 2 - 4</p><p>b = -2</p><p>&nbsp;</p><p>Jadi, jawaban yang tepat adalah D.</p>