x = 2\) is a sensible starting value The result is now too big. X must lie between 2.5 and 2.6. Try 2.55, which is halfway between 2.5 and 2.6. Image caption, 2.6 is too big and 2.55 is too small ...

Find out how to substitute simple expressions and formulae. Find pairs of values that satisfy equations with two variables Learn how to find pairs of values that satisfy equations with two variables.