Question

solve by factorization method
${x}^{2} - 7ix - 12 = 0$
plzz solve I will mark as brainliest ​

Answer 1

using formula

i^2 = - 1,

then ,

12 i^2 = -12

after solving we get two values

3i and 4i

《 answer in the attachment》

hope it helps you❤

Answer 2

SOLUTION

${x}^{2} - 7ix - 12 = 0 \: \: \: \: \: </u><u>[</u><u> - 12 = 12 {i}^{2} </u><u>]</u><u> \ \\ \\ = > {x}^{2} - 7ix + 12 {i}^{2} = 0 \\ \\ = > {x}^{2} - 4ix - 3ix + 12 {i}^{2} = 0 \\ \\ = > x(x - 4i) - 3i(x - 4i) = 0 \\ \\ = > ( x - 4i)(x - 3i) = 0 \\ \\ = > x - 4i = 0 \: \: \: or \: \: \: \: x - 3i = 0 \\ \\ = > x = 4i \: \: \:and \: \: x = 3i$

hope it helps ☺️