Question

X2+ 4x+ k =0 so what is the value of k

Answer 1

$\huge\underline\mathbb{\red Q\pink{U}\purple{ES} \blue{T} \orange{IO}\green{N :}}$

X² + 4x + k = 0 so what is the value of k.

$\huge\underline\mathbb{\red S\pink{O}\purple{LU} \blue{T} \orange{IO}\green{N :}}$

★ Let,

• a = 1
• b = 4
• c = k

$\sf\: By\:using\:Discrimination\:formula\::$

$\sf\purple{ ↪ b^{2} - 4ac = 0}$

• Substitute the values.

$\sf\:: ⟹ (4)^{2} - 4(1)(k) = 0$

$\sf\:: ⟹ 16 - 4k = 0$

$\sf\:: ⟹ 16 = 0 + 4k$

$\sf\:: ⟹ 16 = 4k$

$\sf\:: ⟹ k = \frac{16}{4}$

$\sf\:: ⟹ k = 4$

$\underline{\boxed{\bf{\purple{∴ Hence,\:the\:value\:of\:k\:is\:4.}}}}$