Factor the trigonometric expression. 10 cos2 x + 21 cos x − 10

please help! There is more than one correct form of the answer
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1 Answer

duplikut...yu hav kosine^2, ^1, ^0

with numbers in front=10,21, -10

yuze quadratik equashun

it sae roots=0.4 & -2.5

so kosine=0.4....(-2.5 not legal kosine)
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