Respuesta :

MagniStratus
I'm assuming you're trying to solve for r.
First divide a to both sides
Now you have [tex] \frac{S}{a} [/tex] = a - r
Subtract a to both sides.
And then divide by -1 to both sides.
Now your equation is -[tex] \frac{S}{a} [/tex] + a = r
Expand: a^2 - ar

S= a^2 -ar

S+ ar = a^2

Ar = a^2 - S

R = a^2 - S/ a

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