factors of x²- 14 x²-147 are
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Comparing with ax²+bx+c=0 we get,
a=1, b=(-14), c=(-147)
x²-14x-147=0
x²-21x+7x-147=0
x(x-21)+7(x-21) = 0
(x-21)(x+7) = 0
Hence, x=21 or x=(-7)
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