Factor by grouping 7r3 - 8r2 + 42r - 48

(7r-8)  (r^2 +6)

Step-by-step explanation:

7r^3 - 8r^2     + 42r - 48

In the first group factor out r^2  and in the last group factor out 6

r^2 (7r -8)    + 6(7r - 8)

Factor out (7r-8)

(7r-8)  (r^2 +6)

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step-by-step explanation:

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