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(4-x)(4+x) (x-4)(x+4) (8+x)(8-x) (4-x)2
48-(16x+12x-4x2)=16 16x+2x(6-2x)=32 (8-x)(6-x)=16 (8-2x)(6-2x)=16
(4-x)(4+x) (x-4)(x+4) (8+x)(8-x) (4-x)2
(4-x)(4+x) (x-4)(x+4) (8+x)(8-x) (4-x)2
3< x <5 x > 5 x <3 -3< x <5
(4-x)(4+x) (x-4)(x+4) (8-x)(8+x) (4-x)2
-ln(4-x) -4ln(4-x) -ln(4-x)-ln4 -ln(4-x)+ln4
(6-2x)(10-2x) x(6-x)(10-x) x(6-2x)(10-2x) x(6-2x)(10-x)
-log2(4-x) log2(4-x) -log2(3-x) log2(3-x)