16.p² - 6p – 40
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le product of two
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.p² - 6p – 40=0
p²-(10-4)p-40=0
p²-10p+4p-40=0
p (p-10) +4(p-10) =0
(p-10)(p+4)=0
:.(p-10)=0 or, (p+4)=0
:.p=10 :.p=-4
:.p=10 or, -4
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