Question

find k ifx -1is a factor of 4xcube +3X square -4X +k

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Answer 1

Answer:

k= -3

Step-by-step explanation:

x-1=0

x=1

p(1)=4(1)^3+3(1)^2-4(1)+k

0=4+3-4+k

0=3+k

-3=k

Answer 2

Step-by-step explanation:

x-1 is a factor

then suppose x=1,

then in the equation 4x³ + 3x² - 4x + k put the supposed value of x.

So, it's like

= 4(1)³+3(1)²-4(1)-k

=4+3-4-k

=3-k

we send k that side because k is negative and we want positive answer

so after sending k that side

it become k=3

So our final answer k=3