(x+2y-5z)²-(x-2y+5z)² from factorisation
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Answer:
(x +2y - 5z)^2 - (x -2y + 5z)^2
{(x + 2y - 5z) - ( x -2y + 5z)} {(x +2y - 5z) + ( x - 2y + 5z)}
( x + 2y - 5z - x + 2y - 5z) ( x + 2y -5z +x -2y + 5z)
(4y - 10z) 2x
8xy - 20zx