I don't understand what is going on in the pink area. Can someone explain this? thanks
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it's just factoring ... $\displaystyle 8(x+3)^7 (x-5)^4 + 4(x+3)^8(x-5)^3 = 0$ note the two terms have $\displaystyle 4(x+3)^7$ and $\displaystyle (x-5)^3$ in common. factor them out ... $\displaystyle 4(x+3)^7(x-5)^3[2(x-5) + (x+3)] = 0$
oh I see now. ok thanks!
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