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What is the factored form of the polynomial f (x) = 8x³ - 60x² +150x - 125?

User Rupok
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1 Answer

3 votes

Answer:

(2x-5)^3

Explanation:

(((8 • (x3)) - (22•3•5x2)) + 150x) - 125

((23x3 - (22•3•5x2)) + 150x) - 125

3.1 8x3-60x2+150x-125 is not a perfect cube

Factoring: 8x3-60x2+150x-125

Thoughtfully split the expression at hand into groups, each group having two terms :

Group 1: 150x-125

Group 2: -60x2+8x3

Pull out from each group separately :

Group 1: (6x-5) • (25)

Group 2: (2x-15) • (4x2)

Bad news !! Factoring by pulling out fails :

The groups have no common factor and can not be added up to form a multiplication.

User Casaout
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