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Linear and Quadratic Equations · Question 58 of 66

Question 58

EasyOriginal question

What is the sum of the roots of 5x2−15x+7=05x^2 - 15x + 7 = 0?

Options for question 58

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Sum of roots =−ba=−−155= -\frac{b}{a} = -\frac{-15}{5}.

  2. =3= 3.

Worth noting

−3-3 forgets the minus sign in −ba-\frac{b}{a}; 75\frac{7}{5} is the product; 15 forgets to divide by aa.

Concept
Sum of roots = −b/a
Typical time
40 s
Your time
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The rule this testsRoots and their nature
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