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標題:
If quadratic equation (k-1)x2-7x-3=0 has a double real root,find(a)the possible value(s) of k,(b)the root of the equation.?
發問:
Sol (a) D=0 7^2-4*(k-1)*(-3)=0 49+12k-12=0 12k=-37 k=-37/12 (b) (k-1)x^2-7x-3=0 (-49/12)x^2-7x-3=0 49x^2+84x+36=0 (7x+6)^2=0 x=-6/7 (重根)
其他解答:
If quadratic equation (k-1)x2-7x-3=0 has a double real root,find(a)the possible value(s) of k,(b)the root of the equation.?
發問:
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最佳解答:Sol (a) D=0 7^2-4*(k-1)*(-3)=0 49+12k-12=0 12k=-37 k=-37/12 (b) (k-1)x^2-7x-3=0 (-49/12)x^2-7x-3=0 49x^2+84x+36=0 (7x+6)^2=0 x=-6/7 (重根)
其他解答:
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