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if alpha and beta are the zeroes of the polynomial 21x²_x_2,find a quadratic polynomial who 's zeroes are 2alpha and 2beta
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(3x-1) (7x+2)=0

x= 1/3 or -2/7

P(x)=x^2-{(1/3)+(-2/7)}x-(2/21)=0

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(3x-1) (7x+2)=0x= 1/3 or -2/7P(x)=x^2-{(1/3)+(-2/7)}x-(2/21)=0