# 1st Quarterly Examination in Math-9

## Quiz by WILLIAM E. FELISILDA

Grade 9

Mathematics

Philippines Curriculum: Grades 1-10

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9 questions

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- Q1What is a discriminant?The discriminant helps tell you the vertex of a quadratic equation.The discriminant helps tell you the nature of roots of a quadratic equation.discriminant helps tell you the solution of a quadratic equationThe discriminant helps tell you the trend of the graph of a quadratic equation30s
- Q2How do we get the discriminant of quadratic equations?By substituting the values a, b and c in .By substituting the values a, b and c in .By substituting the values a, b and c inBy substituting the values a, b and c in b2 – 4ac.30s
- Q3What is the nature of roots if the discriminant is -3?. The roots are real numbers and are equalThe roots are rational numbers but are not equal.The equation has no real roots.The roots are irrational number and are not equal30s
- Q4What is the discriminant of the quadratic equation 3x2 – 2x + 4 = 0?4448-44-4830s
- Q5Your classmate says that the quadratic equation 2x2 + 5x – 4 = 0 has two rational and unequal roots because the value of its discriminant is positive. Do you agree with your classmate?Yes, because the discriminant is 57No, because the discriminant is -7.No, because the roots are unequal irrational numbers.No, because the roots are equal rational numbers30s
- Q6How do we get the sum of the roots of quadratic equations?By substituting the values a, b and c inBy substituting the values a, b and c inA. By substituting the values a, b and c in b2 – 4ac.By substituting the values a, b and c in .30s
- Q7How do we get the product of quadratic equations?By substituting the values a, b and c in .By substituting the values a, b and c in. By substituting the values a, b and c in b2 – 4ac.By substituting the values a, b and c in .30s
- Q8What is the sum of the roots of 2x2 – 50 = 0?05-52530s
- Q9Your classmate says that the standard form of the quadratic given the roots -3 and 15 is quadratic x2 + 12x – 45. Do you agree with your classmate?No, the quadratic equation is x2 – 12x – 45.No, the quadratic equation is x2 – 12x + 45No, the quadratic equation is x2 + 12x + 45Yes, the quadratic equation is x2 + 12x – 45.30s