Worked solution
Compare a V graph with a logarithm across a pole
Solve graphically the inequality . marks
[2016/SRJC/Promo/1]
CJC · Review Problems · Question 12
Answer
, where , are the intersections.
Graphical solution
The logarithm requires , so . It has vertical asymptote . Sketch and on the same axes. The source gives intersections approximately and . Read where the V graph is on or above the logarithm: in the printed three-significant-figure form, or or .
Boundary precision
Let be the two exact intersection inputs satisfying . Numerically and . The exact set is . The displayed source decimals are rounded graph readings, not exact thresholds.
Compare your sketch
Expand diagramFit diagram to page
Use the scrollbars or arrow keys to inspect details.
Common mistakes
Equality includes the two curve intersections, but x=1 stays excluded because the logarithm is undefined.
Solution notes
The diagrams are independently reconstructed mathematical equivalents. The plotted geometry is illustrative; use the labelled exact or approximate values and the stated domain.