kaylieholliday129 kaylieholliday129

16-01-2020
Mathematics

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3r² – 16r-7=5

please help me asap

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Leora03 Leora03

16-01-2020

Answer:

r=-2/3 or r= 6

Step-by-step explanation:

To solve this equation to find r, first subtract 5 from both sides.

3r² - 16r -7 -5= 5 -5

3r² - 16r -12= 0 (simplify)

(3r + 2)(r - 6)= 0 (factorise the equation)

3r+2=0 or r-6=0

3r= -2 or r= 6

r= -2/3

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