Q. Factor the expression completely.70x−40x4Answer:
Identify GCF: Identify the greatest common factor (GCF) of the terms in the expression.The terms are 70x and 40x4. The GCF of the numerical coefficients (70 and 40) is 10. Both terms also have an x term, so the GCF is 10x.
Factor out GCF: Factor out the GCF from the expression.We can write the expression as 10x(7−4x3).
Check for further factoring: Check if the remaining expression inside the parentheses can be factored further.The expression inside the parentheses is 7−4x3, which is a difference of two cubes since 7 is 23 and 4x3 is (2x)3.
Factor difference of cubes: Factor the difference of two cubes using the formula a3−b3=(a−b)(a2+ab+b2). Here, a is 2 and b is 2x, so we get (2−2x)(22+2⋅2x+(2x)2).
Simplify factored form: Simplify the factored form of the difference of two cubes.We get (2−2x)(4+4x+4x2).
Combine with GCF: Combine the GCF factored out earlier with the factored form of the difference of two cubes.The completely factored expression is 10x(2−2x)(4+4x+4x2).
Check for further simplification: Check for any further simplification or common factors in the factored terms.There are no further common factors, and the expression is fully simplified.
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