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Example (5) : Note that: (a - b)2 = a2 - 2ab + b2
If x = 5v3 - 1 , ?? = 5v3 + 1
Find the value pf the expression: ??2 - 2 ???? + ??2
Solution:
???? - ?? ???? + ???? = ( X - Y )2
= ( ??v?? - ?? - ??v?? - ?? )??
= (-??)??
=4
1ST TERM MATH-PREP.2
26 | P a g e
