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Verified Answer :

apologiabiology

expand
x^2+3x-10=18
minus 18 both sides
x^2+3x-28=0
find what 2 numbers mutiply to -28 and add to 3
7 and -3 
(x+7)(x-3)=0
set each to zero

x+7=0
x=-7
x-3=0
x=3

x=-7 and 3

I hope this helps you

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