A) \[(x-1)\]
B) \[(x-2)\]
C) \[(x-6)\]
D) \[(x-8)\]
Correct Answer: D
Solution :
Cost of \[(x-5)\] notebooks is \[({{x}^{2}}-13x+40)\]To calculate the cost of 1 notebook, we factorize \[({{x}^{2}}-13x+40)\] \[{{x}^{2}}-13x+40={{x}^{2}}-8x-5x+40\] \[=x(x-8)-5(x-8)=(x-8)(x-5)\] \[\therefore \]Cost of one notebook\[=(x-8)\times \frac{(x-5)}{x-5}\] \[=x-8\]You need to login to perform this action.
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