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liza14011
@liza14011
July 2022
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(-7f-2)²-(5f+4)²-4(6f²-5)=-28
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samotugaa
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(-7f-2)^2-(5f+4)^2-4×(6f^2-5)=-28, 49f^2+28f+4-(25f^2+40f+16)-24f^2+20=-28, 49f^2+28f+4-25f^2-40f-16-24f^2+20=-28, -12f+8=-28, 36=12f, f=3.
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Verified answer
(-7f-2)^2-(5f+4)^2-4×(6f^2-5)=-28, 49f^2+28f+4-(25f^2+40f+16)-24f^2+20=-28, 49f^2+28f+4-25f^2-40f-16-24f^2+20=-28, -12f+8=-28, 36=12f, f=3.