Question

Find the value of K, If x-3 is a factor of 4x²-15x+k

Answer 1

Answer:

x-3=0

x=3

put value of x in Given polynomial

4x2-15+k=0

4(3)^2-15+k=0

36-15+k=0

21+k=0

k=-21

Step-by-step explanation:

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Answer 2

$if \: x - 1 \: a \: factor \: of \: {4x }^{2} - 15x + k$

$so \: x - 3 = 0 \\ then \: x = 3$

$now \: let \: us \: put \: x = 3 \: in \: the \: equation$

${4(3)}^{2} - 15(3) + k = 0$

$4(9) + 15(3) + k = 0 \\ 36 + 45 + k = 0 \\ let \: us \: take \: 36 \: and \: 45 \: on \: the \: right \: side$

$k = - 36 - 45$

$k = - 81 \\ thanks...$

and it was not -21 check his / her comment it was 15x he /she only wrote 15