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One root of 5x^(2) +6x +k =0 is double the other. Find the roots and find the value of k
you have to use the roots and coefficient rules of polynomials i.e. alpha + beta = -(b/a)
A + B = -6/5 and A*B = k / 5 let A = 2B so 2B + B = -6/5 2B*B = k/5 you need to solve this system for B and k