Tolong bantu jawab kak beserta rumusnya, Terimakasih kak🙏🏻

<p>Maka a² + 4a + 19 adalah <strong>16 (A)</strong></p><p>&nbsp;</p><p>Pembahasan :</p><p>(a + 2)x + y = 0 → ax + 2x + y = 0 ... (1)</p><p>x + (a + 2)y = 0 → x + ay + 2y = 0 ... (2)</p><p>&nbsp;</p><p>Mengurangi persamaan (1) dan (2) untuk mencari nilai a :</p><p>ax + 2x + y = 0</p><p><u>x + ay + 2y = 0</u> &nbsp;–</p><p>ax + x - ay - y = 0</p><p>ax - ay = - x + y</p><p>a(x - y) = -(x - y)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;a = -(x - y)/(x - y)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;a = -1</p><p>Subtitusi a = -1 :</p><p>&nbsp;a² + 4a + 19 = (-1)² + 4(-1) + 19 = 1 - 4 + 19 = 16</p><p>&nbsp;</p><p>Selesai :D 🙏&nbsp;</p><p>Mohon koreksinya, terimakasih&nbsp;</p>