factoring by grouping how do i solve it 8r^3-64^2+r-8

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24-02-2015
Mathematics

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factoring by grouping how do i solve it 8r^3-64^2+r-8

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heyDB heyDB · Answer 1 · 2015-02-24T22:51:24+01:00

heyDB heyDB

24-02-2015

Squaring a number is the same as multiplying the number by itself (64⋅64). In this case, 64 squared is 4096.
8r^3−4096+r−8

Subtract 8 from −4096 to get −4104.
8r^3−4104+r

Factor the polynomial using the rational roots theorem.
(r−8)(8r^2+64r+513)

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