Question

The value of k if the expression x2 + 3x – k equals to 8 for x=2 is
A 8
B З
C 2
D 5

Answer 1

Answer:

so we are given the value of x... just put that in the expression ans is 2

Step-by-step explanation:

x^2 +3x -k = 8

x^2 +3x -k = 8 x=2

x^2 +3x -k = 8 x=22^2 + 3×2 - k =8

x^2 +3x -k = 8 x=22^2 + 3×2 - k =8 4 + 6 -k=8

x^2 +3x -k = 8 x=22^2 + 3×2 - k =8 4 + 6 -k=810-k=8

x^2 +3x -k = 8 x=22^2 + 3×2 - k =8 4 + 6 -k=810-k=8-k = 8-10

x^2 +3x -k = 8 x=22^2 + 3×2 - k =8 4 + 6 -k=810-k=8-k = 8-10k = 2

x^2 +3x -k = 8 x=22^2 + 3×2 - k =8 4 + 6 -k=810-k=8-k = 8-10k = 2option C

Answer 2

Answer:

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