5m Zen
X power 4 minus y
X power 4 minus y pictures 5
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X power 4
X power 4 minus y
x power 4 y power 4 minus xy
x minus y whole power 4
81 x power 4 minus y power 4
16 x power 4 minus y power 4
factorise 16x to the power 4 minus y to the power 4
x power 4 minus y square 2 x square 1
x power 4 minus y z whole power 4
x power 4 minus y z power 4
x power 4 minus y power 4
