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plzz solve question 15 and also show working steps.THANKS IN ADVANCE♡

plzz solve question 15 and also show working steps.THANKS IN ADVANCE♡

Question Image
Grade:11

1 Answers

Arun
25768 Points
2 years ago
Dear Ritish
 
we can write it as 
98 + sqrt (x^3 – x^2 – 12 x + 36) = 10^2
sqrt (x^3 – x^2 – 12 x + 36) = 100 – 98 = 2
squaring both the sides
(x^3 – x^2 – 12 x + 36) = 4
(x^3 – x^2 – 12 x + 32) = 0
Now use have to use hit and trial or put the options to check the answer as we have no method to solve cubic polynomial
however it is correct for x = – 4

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