25 - bracket Y - 4 bracket whole ki power square
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hope it helps..........
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=25-(y-4)²
=25-(y²-8y+16)
=25-y²+8y-16
=9-y+8y
=9+7y
=25-(y²-8y+16)
=25-y²+8y-16
=9-y+8y
=9+7y
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