Evaluation and simplification of the simplest quadratic radical When x = (2 minus root sign 3) 1 / 2, find the value of the algebraic formula (square of x minus 4x plus 2). Please continue to explain how to do step by step in detail. Thank you very much! I have an answer here, but I don't get it. Answer: because (x = 2 plus root 3) so (X-2 = root 3) so (square of x minus 4x + 4 = 3) how does this "square of x minus 4x + 4 = 3" come from? Thank you. I really don't understand

Evaluation and simplification of the simplest quadratic radical When x = (2 minus root sign 3) 1 / 2, find the value of the algebraic formula (square of x minus 4x plus 2). Please continue to explain how to do step by step in detail. Thank you very much! I have an answer here, but I don't get it. Answer: because (x = 2 plus root 3) so (X-2 = root 3) so (square of x minus 4x + 4 = 3) how does this "square of x minus 4x + 4 = 3" come from? Thank you. I really don't understand

First of all, the winning prize on the first floor is deceitful! Don't be fooled! Let me give you an answer! First, multiply "x = (2 minus root sign 3) 1 / 2" by "2 + root sign 3" to get "x = 2 + root sign 3". After simplifying "algebraic formula (square of x minus 4x plus 2)" to (X-2) square minus 2, and substituting "x = 2 + root sign 3" to get the answer, algebraic formula is equal to 1!

Second radical, first simplify, then evaluate
(1) √ 2x - √ 8x & # 179; + 2 √ 2XY & # 178; where x = 3, y = - 1
(2) 2 √ (25a) - 3 √ (A & # 178; b) + 5 √ (36a) - 2 √ (A & # 178; b) where a = 3, B = 5

（1）√2x-√8x³+2√2xy²=√2x-2√2x³+2√2xy²=√2x（1-2x²+2y²）=√2x[1+2(y²-x²)]=√2x[1+2(y+x)(y-x)]=3√2[1+2*2*(-4)]=3√2 *(-15)= -45√2(2)2√（25a）-3√（a²...