Bob
]]>it was supposed to be a²x + bx - a²z - bz
thx for overlooking that mistake. and thx so much for helping me.
]]>Is it possible to solve this problem with the grouping method?
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]]>a²x - a²z
a²(x-z)
]]>(x - z) (a^4 - b²) ?
]]>a²x + bx - a²z - bx
]]>