Mathematics for IGCSE & O level - Graphs Of Functions (Section 4 - No. 44)
When drawing a tangent line to estimate a gradient, what is the best approach for choosing points to calculate the gradient?
Choosing points at the smallest x values
Choosing points that make the x increase an easy number.
Choosing points at the largest y values.
Choosing points that are close together.
Explanation
When choosing two points to work out the gradient of the tangent, it is easiest to make the x increase an easy number.
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