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2023-II-10

Posted on 20-07-2023 By app.cch No Comments on 2023-II-10
Ans: D

A is not true. Rewrite the equation of the graph to the general form, we have

$\begin{array}{rcl}
y & = & 5+(x-3)^2 \\
y & = & 5+x^2-6x+9 \\
y & = & x^2-6x+14 \ldots \unicode{x2460}
\end{array}$

Since the coefficient of $x^2$ is positive, the graph opens upwards.

B is not true. The discriminant of $\unicode{x2460}$

$\begin{array}{cl}
= & (-6)^2 -4(1)(14) \\
= & -20 \\
< & 0 \end{array}$

Therefore, there is no $x$-intercept for the graph.

C is not true. From $\unicode{x2460}$, the $y$-intercept is $14$.

D is true. Sub. $x=3$ into the RS of $\unicode{x2460}$, we have

$\begin{array}{rcl}
y & = & 3^2-6(3)+14 \\
y & = & 5
\end{array}$

Therefore, the graph passes through $(3,5)$.

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2023, HKDSE-MATH, Paper 2 Tags:Quadratic Equations and Functions

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3D Problems (41) Basic Functions (13) Basic Geometry (68) Binomial Theorem (7) Change of Subject (32) Complex Numbers (16) Coordinates (46) Differentiation (16) Equations of Circle (54) Equations of Straight Line (43) Estimations and Errors (35) Factorization (39) Graph of Functions (3) Inequality (39) Integration (15) Laws of Indices (43) Linear Programming (21) Locus (13) Logarithm (34) Mathematical Induction (7) Matrices (4) Mensuration (98) Numeral System (19) Percentage (42) Polynomials (49) Probability (85) Properties of Circles (56) Quadratic Equations and Functions (57) Rate and Ratio (30) Rational Functions (20) Sequences (66) Simultaneous Linear Equations (27) Statistics (122) System of Linear Equations (3) Transformations (44) Trigonometry (M2) (7) Trigonometry and Its Applications (67) Variations (38) Vectors (3)

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