Can someone explain to me, STEP BY STEP how to do this problem please, its Algebra 2-Complex numbers. -6(x+5)^2=120

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first divide both sides by -6 what u get ?

and u should know that \(\huge \sqrt{-1}=i\)

6(x+5)^2+120 = (x+5)^2 - 20i^2 =0 ( and then factorise ) as i^2 =-1

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