Question

Q 7) What is the value of k, if
one root of the quadratic
equation is 3? *
kx2 - 7x + 12 = 0
1) -3
2) -1
3) 1
4) 3​

Answer 1

Answer:

$\mapsto \large \color{yellow} QUESTION :$

➡ What is the value of k, if one root of the quadratic equation is 3? kx2 - 7x + 12 = 0

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GIVEN :

one of the roots is 3 , So, substituting 3 in place of x,

$\leadsto \: \: k( {3}^{2} ) - 7(3) + 12 = 0$

$\leadsto \: 9k - 21 + 12 = 0$

$\leadsto \: 9k \: = 9$

$\huge \: \mapsto \color{yellow} \boxed {k = 1}$

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Step-by-step explanation:

hope it helps.....!