If one of the roots of quadratic equation 7x² - 50x + k = 0 is 7, then what is the value of k?
Substituting the root \(x = 7\) into \(7x^2 - 50x + k = 0\) gives \(7(49) - 50(7) + k = 0 \implies 343 - 350 + k = 0 \implies k = 7\).
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If one of the roots of quadratic equation 7x² - 50x + k = 0 is 7, then what is the value of k?
Answer and explanation
Correct answer A
Substituting the root into gives .
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