Review Exercise - Chapter 1

(i) Standard form of quadratic equation is

• (a) $bx + c = 0, b \neq 0$
• (b) $ax^2 + bx + c = 0, a \neq 0$
• (c) $ax^2 = bx, a \neq 0$
• (d) $ax^2 = 0, a \neq 0$

(ii) The number of terms in a standard quadratic equation $ax^2 + bx + c = 0$ is

• (a) 1
• (b) 2
• (c) 3
• (d) 4

(iii) The number of methods to solve a quadratic equation is

• (a) 1
• (b) 2
• (c) 3
• (d) 4

(iv) The quadratic formula is

• (a) $x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$
• (b) $x=\frac{b\pm \sqrt{b^2-4ac}}{2a}$$x = \frac{b \pm \sqrt{b^2 - 4ac}}{2a}$
• (c) $x=\frac{-b\pm \sqrt{b^2+4ac}}{2a}$$x = \frac{-b \pm \sqrt{b^2 + 4ac}}{2a}$
• (d) $x=\frac{b\pm \sqrt{b^2+4ac}}{2a}$$x = \frac{b \pm \sqrt{b^2 + 4ac}}{2a}$

(v) Two linear factors of $x^2 - 15x + 56$ are

• (a) $(x - 7)$ and $(x + 8)$
• (b) $(x + 7)$ and $(x - 8)$
• (c) $(x - 7)$ and $(x - 8)$
• (d) $(x + 7)$ and $(x + 8)$