SSC CPO SI and ASI Model Paper 6

Question : 137 of 200

Marks: +1, -0

What will be the value of

x^4 – 10x^3 + 10x^2 – 10x +10 for x = 9?

Solution:

(3)

x^4 – 10x^3 + 10x^2 – 10x +10

= x^4 – 9x^3 – x^3 + 9x^2 + x^2 – 9x – x+10

= 9^4 – 9.9^3 – 9^3 + 9. 9^2 + 9^2 – 9.9– 9 +10

= 9^4 – 9^4 – 9^3 + 9^3 + 9^2 – 9^2 – 9+10

= 1

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