Question

x² - 4x3 + ax² + 8x +44 when x = 3+2i​

Answer 1

Step-by-step explanation:

$x { }^{2} - 4 \times 3 + ax {}^{2} + 8x + 4 \\( 3 + 2) {}^{2} - 12 + a \times (3 + 2) {}^{2} + 8(3 + 2) + 4 \\ 5 {}^{2} - 12 + a5 {}^{2} + 24 + 16 + 4 \\ 25 - 12 + 25a + 24 + 16 + 4 = 0 \\ 57 + 25a = 0 \\ 25a = - 57 \\ a = - 57 \div 25 \\ a = - 2.28$