Identify GCF: Identify the greatest common factor (GCF) of the terms in the expression 50−8x10. The GCF of 50 and 8 is 2. However, since 8 is a multiple of 2 and we have an x term with a power of 10, we should look for the GCF that includes the variable as well. The GCF that includes the variable is 2x10 since x10 is the highest power of x present, but we cannot use x10 as a factor because it is not a factor of the constant term 50. Therefore, the correct GCF is just 2.
Factor out GCF: Factor out the GCF from the expression. 2(25−4x10)Check to ensure that when we distribute the 2 back into the parentheses, we get the original expression.2×25=502×(−4x10)=−8x10The original expression is correctly factored.
Check for Further Factoring: Check if the expression inside the parentheses can be factored further.The expression 25−4x10 is a difference of squares because it can be written as (52)−(2x5)2.We can factor a difference of squares using the identity a2−b2=(a+b)(a−b).
Apply Difference of Squares: Apply the difference of squares identity to factor the expression inside the parentheses.(5+2x5)(5−2x5)Ensure that when we square the terms 5 and 2x5, we get the original terms inside the parentheses.(5)2=25(2x5)2=4x10The factoring is correct.
Combine GCF with Factored Form: Combine the GCF with the factored form of the expression inside the parentheses to get the final factored form. 2(5+2x5)(5−2x5)Check one last time to ensure that when we distribute the 2 into the factored form and then multiply the binomials, we get the original expression.