S4 Maths final exam revision(Ch.1-Ch.4)

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二次方程 2x² – 3x + 2 = 0

The quadratic equation 2x² – 3x + 2 = 0 has

• 沒有實根。

  no real roots.

• 有兩個相等實根。

  two equal real roots.

• 有兩個不等實根。

  two distinct real roots.

• 有一個二重實根。

  a double real root.

下列哪一方程有一個二重根?

Which of the following equations has a double root?

• x² + 6x – 9 = 0

• x² – 6x – 9 = 0

• x² – 6x + 9 = 0

• 2x² – 6x + 9 = 0

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解方程 4x(x–5) = 0。

Solve 4x(x–5) = 0.

• 只有5

  5 only

• 0 或 5

  0 or 5

• 0 或 –5

  0 or –5

• 4 或 5

  4 or 5

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下列何者的根為 5 及 –6 ?

Which of the following equations has the roots of 5 and –6 ?

• x² + x + 30 = 0

• x² – x – 30 = 0

• x² + x – 30 = 0

• x² + 11x – 30 = 0

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