Question

26. If a root of x²-(a +4)x - 18 = 0 is -3, then the value of 'a' is
a) 13
b) 14
C) -1
d) -14​

Answer 1

Answer:

✧ Given ,

☑️ root of the equation = - 3

so

${x}^{2} - (a + 4)x - 18 = 0 \\ \\ = > {( - 3)}^{2} - (a + 4) \times ( - 3) - 18 = 0 \\ \\ = > 9 - ( - 3a - 12) - 18 = 0 \\ \\ = > 9 + 3a + 12 - 18 = 0 \\ \\ = > 9 + 3a - 6 = 0 \\ \\ = > 3 + 3a = 0 \\ \\ = > 3a = - 3 \\ \\ = > a = \frac{ - 3}{3} \\ \\ = > a = - 1$

hope this much helps uh ❣️