**This is where you draw a grid and find out if your estimate is too big or too small.**

**EG1) At the top of the first colum it is x. At the top of the second colum it is the sum. At the top of the third colum it is Too Big / Too Small. All you do now is estimate.**

X16 |
x(squared) + x = 50 256 + 16 = 272 |
Too Big / Too SmallToo Big |

**You keep estimating after this. Because you see x can't be 16 as it is too big you choose lower numbers. You then guess any lower numbers. If you estimate the number 7 it would still be too big because the sum would be 49 + 7 = 56. If you chose the number 6 it would be too small because the sum would be 36 + 6 = 42. You then go to 6.5 but that is too small because the sum is 42.25 + 6.5 = 48.75. So you go to 6.6 but that is too big because the sum is 43.56 + 6.6 = 50.16. 6.55 is too small because the sum is 42.9 + 6.55 = 49.5. The answer is 6.6!**

**Questions :**

1. x(squared) + 5x = 2400. What is the value of x?

2. x(squared) - 5x = 27. What is the value of x?

3. x(squared) + 5x = 20. What is the value of x?

1. x(squared) + 5x = 2400. What is the value of x?

2. x(squared) - 5x = 27. What is the value of x?

3. x(squared) + 5x = 20. What is the value of x?