If 4 is a root of the equation x 2 + kx - 4 = 0; the value of k is : 1. 3 2. -3 3. 2 4. -2

Since, 4 is the root of the equation x 2 + kx - 4 = 0. ∴ It will satisfy the equation x 2 + kx - 4 = 0. ∴ 4 2 + 4k - 4 = 0 ⇒ 16 + 4k - 4 = 0 ⇒ 4k + 12 = 0 ⇒ 4k = -12 ⇒ k = - = -3. Hence, Option 2 is the correct option.

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(x - 3)(x + 5) = 0 gives x equal to :
3
3 or 5
3 or -5
3 and -5

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The equation 2x² - 3x + k = 0 is satisfied by x = 2; the value of k is :
-2
2
4
3

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If x² - 7x = 0; the value of x is :
0 and 7
7
0
0 or 7

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Mathematics

If 4 is a root of the equation x² + kx - 4 = 0; the value of k is :
3
-3
2
-2

Quadratic Equations

Related Questions

(x - 3)(x + 5) = 0 gives x equal to :
3
3 or 5
3 or -5
3 and -5

The equation 2x² - 3x + k = 0 is satisfied by x = 2; the value of k is :
-2
2
4
3

If x² - 7x = 0; the value of x is :
0 and 7
7
0
0 or 7

Mathematics

If 4 is a root of the equation x2 + kx - 4 = 0; the value of k is :3-32-2

Quadratic Equations

Related Questions

(x - 3)(x + 5) = 0 gives x equal to :33 or 53 or -53 and -5

The equation 2x2 - 3x + k = 0 is satisfied by x = 2; the value of k is :-2243

If x2 - 7x = 0; the value of x is :0 and 7700 or 7

If 4 is a root of the equation x² + kx - 4 = 0; the value of k is :
3
-3
2
-2

(x - 3)(x + 5) = 0 gives x equal to :
3
3 or 5
3 or -5
3 and -5

The equation 2x² - 3x + k = 0 is satisfied by x = 2; the value of k is :
-2
2
4
3

If x² - 7x = 0; the value of x is :
0 and 7
7
0
0 or 7