Find and correct the errors (if any) in the following expressions:
i.)(5x−2)2=25x2+4−20x
ii.)(3x+2)2=3x2+6x+4 [2 MARKS]
Concept: 1 Mark each
Using the identities (a)2−2×a×b+(b)2=(a−b)2 and (a)2+2×a×b+(b)2=(a+b)2
i.)(5x−2)2=25x2+4−20x is correct and there is no error.
ii.)(3x+2)2=3x2+6x+4 is wrong .
The correct equation is
(3x+2)2=9x2+12x+4.