Factorise 17 x square - 8 x + 8
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17x^2-8x+8
d=(b)^2×-4ac
d=(-8)^2-4×17×8
d=64-4×136
d=64-544=-480
d is less than zero
so no real roots exists
d=(b)^2×-4ac
d=(-8)^2-4×17×8
d=64-4×136
d=64-544=-480
d is less than zero
so no real roots exists
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