Question

find k if x=4 is one root of x^2-7x+k=0​

Answer 1

Answer:

⭐ Answer ⭐

${x}^{2} - 7x + k = 0 \\ \\ {(4)}^{2} - 7(4) + k = 0 \\ \\ 16 - 28 + k = 0 \\ \\ 12 + k = 0 \\ \\ k = - 12$

Answer 2

Gudnyt

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Here's ur answer

Let p(x) = x²-7x+k

Since x=4 is a root of the equation p(x),

p(4) = 0

p(4) = (4)² - 7*4 + k = 0

16-28+k = 0

k-12 = 0

k = 12

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