Dreamcatcher0107
Dreamcatcher0107
15-05-2017
Mathematics
contestada
How do I solve for r
Respuesta :
ashsmith
ashsmith
15-05-2017
to solve for R you use PEMDAS
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FLORC
FLORC
15-05-2017
4 (r-10)^2+2=38
expand 4 [(r-10)(r-10)]+2=38
solve r-10×r-10
4 (r^2-20r+100)+2=38
-2 both sides
4 (r^2-20r+100)=36
÷4 both sides
r^2-20r+100=9
-9 both sides
r^2-20r+91=0
(r-7)(r-13)=0
r=7,13
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