Question

What is the value of k in polynomial x2 + 8x + k , if -1 is a zero of the polynomial?​

Answer 1

Answer:

x^2+8x+k=0

=>ax^2+bx+c=0

a=1,b=8 and c=k

b^2-4ac=-1

=>(8)^2-4*1*k=-1

=>64-4k=-1

=>64+1=4k

=>k=65/4

Answer 2

Answer:

${x}^{2} + 8x + k = 0 \\ { - 1}^{2} + 8( - 1) + k = 0 \\ 1 - 8 + k = 0 \\ - 7 + k = 0 \\ k = 0 + 7 \\ \underline{\underline{\boxed{\green{ k = 7}}}}$

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