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224 Chapter 3 Exponential and Logarithmic Functions<br />
116.<br />
24xy 2<br />
16x 3 y 24xx3<br />
16yy 2 3x4<br />
2y 3 117.<br />
2x2<br />
3y 3 <br />
3y<br />
2x 23<br />
3y3<br />
2x 2 3<br />
27y3<br />
8x 6<br />
118. 18x 3 y 4 3 18x 3 y 4 3 18x3 y 4 3<br />
1 if x 0, y 0<br />
18x 3 y 4 3<br />
<br />
119.<br />
xyx 1 y 1 1 <br />
xy<br />
x 1 y 1<br />
<br />
xy<br />
1<br />
x 1 y<br />
120.<br />
x 2 6x 2 0<br />
x <br />
6 ± 36 42<br />
2<br />
3 ± 7<br />
<br />
xy<br />
y x<br />
xy<br />
xy2<br />
x y , x 0, y 0<br />
121.<br />
2x 3 20x 2 50x 0<br />
122.<br />
x 4 19x 2 48 0<br />
2xx 2 10x 25 0<br />
x 2 16x 2 3 0<br />
2xx 5 2 0<br />
x 4x 4x 3x 3 0<br />
x 0, 5, 5<br />
x ±4, ±3<br />
123.<br />
9x 4 37x 2 4 0<br />
124.<br />
x 3 6x 2 4x 24 0<br />
x 2 49x 2 1 0<br />
x 2 x 6 4x 6 0<br />
125.<br />
x 2x 23x 13x 1 0<br />
x ±2, ± 1 3<br />
9x 4 226x 2 25 0<br />
x 2 259x 2 1 0<br />
x 5x 53x 13x 1 0<br />
x ±5, ± 1 3<br />
x 2 4x 6 0<br />
x 2x 2x 6 0<br />
x 2, 2, 6<br />
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