csat-suneung 2011 Q4

csat-suneung · South-Korea · csat__math-science 3 marks Solving quadratics and applications Solving an equation via substitution to reduce to quadratic form

For the irrational equation $$\sqrt { 4 x ^ { 2 } - 5 x + 7 } - 4 x ^ { 2 } + 5 x = 1$$ What is the product of all real roots? [3 points]
(1) $- \frac { 1 } { 2 }$
(2) $- \frac { 3 } { 2 }$
(3) $- \frac { 5 } { 2 }$
(4) $- \frac { 7 } { 2 }$
(5) $- \frac { 9 } { 2 }$

For the irrational equation
$$\sqrt { 4 x ^ { 2 } - 5 x + 7 } - 4 x ^ { 2 } + 5 x = 1$$
What is the product of all real roots? [3 points]\\
(1) $- \frac { 1 } { 2 }$\\
(2) $- \frac { 3 } { 2 }$\\
(3) $- \frac { 5 } { 2 }$\\
(4) $- \frac { 7 } { 2 }$\\
(5) $- \frac { 9 } { 2 }$

Paper Questions

Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25 Q26 (Calculus) Q26 (Discrete Mathematics) Q26 (Probability and Statistics) Q27 (Calculus) Q27 (Discrete Mathematics) Q27 (Probability and Statistics) Q28 (Calculus) Q28 (Probability and Statistics) Q29 (Calculus) Q29 (Probability and Statistics) Q30 (Calculus) Q30 (Probability and Statistics)