root fof quadratic equation y2 -16y+63=0
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Step-by-step explanation:
y² - 16y + 63 = 0
=> y² - 9y - 7y + 63 = 0
=> y( y-9 ) -7( y-9 ) = 0
=> ( y-9 ) ( y-7 ) = 0
=> y = 9, 7
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