How do you factor by grouping

If you have a quadratic equation in the form ax2+bx+c
Step 1) Determine the product of AC (the coefficients in a quadratic equation)Step 2) Determine what factors of a⋅c sum to bStep 3) "ungroup" the middle term to become the sum of the factors found in step 2Step 4) group the pairs.

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The difference is 5,100m?