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Use the trial and improvement method to solve the equation 2xcubed+5=24. Find a solution that is a positive number give your answer correct to one decimal place

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1 Answer

Hi Kath;
2x3+5=24
Let's subtract 5 from both sides...
-5+2x3+5=24-5
2x3=19
Let's divide both sides by 2...
(2x3)/2=19/2
x3=9.5
 
x   | x3 | result
1   | 1   |too small
2   | 8   |very close
2.1| 9.3|closest
2.2|10.6|too high
 
x=2.1