Question

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

Answer 1

Step-by-step explanation:

$- 7x + 12 = 3 \\ 12 - 3 = 7x \\ 9 = 7x \\ \frac{9}{7} = x \\ \\ kx {}^{2} \\ k (\frac{9}{7} ) {}^{2} \\ \\ k = \frac{81}{49}$

I hope it helps you