Question

If x = 3 is solution of x² + kx + 15 , value of k is ?
_________________
explain me by step by step ?
not rubbish type ! ​

Answer 1

Given question -:

If x = 3 is solution of x² + kx + 15 , value of k is ?

Now let's try to solve the question

we have given that x = 3

so let's put the value of x in given

equation

${x}^{2} + kx + 15 = 0$

${3}^{2} + 3k + 15 = 0$

$24 + 3k = 0$

$3k = - 24$

$k = - 8$

Hope this will help you

$\huge{ \colorbox{black}{ \color{pink}{thank \: you...}}}$