if x = square root of 3 space end root+ 1 /2 then find the value of 4x cubed + 2x squared- 8x + 7

Asked by Petulla Mishra | 18th May, 2015, 09:38: AM

Expert Answer:

straight x equals fraction numerator square root of 3 plus 1 over denominator 2 end fraction rightwards double arrow 2 straight x equals square root of 3 plus 1 rightwards double arrow 2 straight x minus 1 equals square root of 3 rightwards double arrow left parenthesis 2 straight x minus 1 right parenthesis squared equals 3 rightwards double arrow 4 straight x squared minus 4 straight x plus 1 equals 3 rightwards double arrow 4 straight x squared minus 4 straight x minus 2 equals 0
The value is 10.

Answered by Prasenjit Paul | 18th May, 2015, 12:39: PM