Question

Hi, please help me, explain please

Answer 1

Answer:

$\sf \hookrightarrow \: {2x}^{2} + 3x + k = 0 \\ \sf \hookrightarrow \: 2 {(2)}^{2} + 3(2) + k = 0 \\ \sf \hookrightarrow \: 2 \times 4 + 6 + k = 0 \\ \sf \hookrightarrow \: 8 + 6 + k = 0 \\ \sf \hookrightarrow \: 14 + k = 0 \\ \sf \hookrightarrow \: k = - 14$

Answer 2

Answer:

Step-by-step explanation:

1) substitute x with 2

2*2^2 + 3*2 + k = 0

2) solve the equation

8 + 6 + k = 0

k  + 14 = 0

k = -14