if x=-4/3 is a root of the polynomial f(x)=2x³-5x²+ax+b.
find the values of a and b.
class 9
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f (x) = - 4/3
= 2( -4/3 )³ - 5( -4/3 )² + a( -4/3 ) + b
= - 4.74 - 8.8 + -4/3a + b
= - 13.54 - 4/3a + b
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