quadratic equation by using the zero product rule. 7k squared minus 9k minus 10 equals 0.

I need to solve this quadratic equation by using the zero product rule.
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7x^2 -9x -10=0... quadratik formula giv roots=2 & -0.7142858... b^2-4ac=361, root(361)=19, root/2a=1.357142857142
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