3 years ago

If x=-7 is a root of the equation x^2+kx+49=0, then k=

Mathematics

1 answer:

aleksley [76]3 years ago

8 0

Answer:

$k=14$

Step-by-step explanation:

Given:

$x^{2}+kx+49 = 0$

$x = -7$

Substitution can be used to find the value of $k$ :

$(-7)^{2}+(-7)k+49 = 0$

$49-7k+49 = 0$

$98 -7k = 0$

$k = 14$

Hope this helps :)

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If x=-7 is a root of the equation x^2+kx+49=0, then k=​

If x=-7 is a root of the equation x^2+kx+49=0, then k=