Solution - Factoring binomials using the difference of squares
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Factoring binomials using the difference of squaresStep by Step Solution
Step 1 :
Trying to factor as a Difference of Squares :
1.1 Factoring: m5682-1
Theory : A difference of two perfect squares, A2 - B2 can be factored into (A+B) • (A-B)
Proof : (A+B) • (A-B) =
A2 - AB + BA - B2 =
A2 - AB + AB - B2 =
A2 - B2
Note : AB = BA is the commutative property of multiplication.
Note : - AB + AB equals zero and is therefore eliminated from the expression.
Check : 1 is the square of 1
Check : m5682 is the square of m2841
Factorization is : (m2841 + 1) • (m2841 - 1)
Trying to factor as a Sum of Cubes :
1.2 Factoring: m2841 + 1
Theory : A sum of two perfect cubes, a3 + b3 can be factored into :
(a+b) • (a2-ab+b2)
Proof : (a+b) • (a2-ab+b2) =
a3-a2b+ab2+ba2-b2a+b3 =
a3+(a2b-ba2)+(ab2-b2a)+b3=
a3+0+0+b3=
a3+b3
Check : 1 is the cube of 1
Check : m2841 is the cube of m947
Factorization is :
(m947 + 1) • (m1894 - m947 + 1)
Trying to factor by splitting the middle term
1.3 Factoring m1894 - m947 + 1
The first term is, m1894 its coefficient is 1 .
The middle term is, -m947 its coefficient is -1 .
The last term, "the constant", is +1
Step-1 : Multiply the coefficient of the first term by the constant 1 • 1 = 1
Step-2 : Find two factors of 1 whose sum equals the coefficient of the middle term, which is -1 .
-1 | + | -1 | = | -2 | ||
1 | + | 1 | = | 2 |
Observation : No two such factors can be found !!
Conclusion : Trinomial can not be factored
Trying to factor as a Difference of Cubes:
1.4 Factoring: m2841-1
Theory : A difference of two perfect cubes, a3 - b3 can be factored into
(a-b) • (a2 +ab +b2)
Proof : (a-b)•(a2+ab+b2) =
a3+a2b+ab2-ba2-b2a-b3 =
a3+(a2b-ba2)+(ab2-b2a)-b3 =
a3+0+0-b3 =
a3-b3
Check : 1 is the cube of 1
Check : m2841 is the cube of m947
Factorization is :
(m947 - 1) • (m1894 + m947 + 1)
Trying to factor by splitting the middle term
1.5 Factoring m1894 + m947 + 1
The first term is, m1894 its coefficient is 1 .
The middle term is, +m947 its coefficient is 1 .
The last term, "the constant", is +1
Step-1 : Multiply the coefficient of the first term by the constant 1 • 1 = 1
Step-2 : Find two factors of 1 whose sum equals the coefficient of the middle term, which is 1 .
-1 | + | -1 | = | -2 | ||
1 | + | 1 | = | 2 |
Observation : No two such factors can be found !!
Conclusion : Trinomial can not be factored
Final result :
(m947+1)•(m1894-m947+1)•(m947-1)•(m1894+m947+1)
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