The General Quadratic Formula (VCE SSCE Mathematical Methods): Quizzes

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The General Quadratic Formula
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When is the quadratic formula most useful?

When a quadratic doesn't factor nicely

What is the quadratic formula for ax2+bx+c=0ax^2 + bx + c = 0?

x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

What does x=−b2ax = -\frac{b}{2a} give you?

The axis of symmetry

What is the discriminant in the quadratic formula?

b2−4acb^2 - 4ac

What does a positive discriminant (b2−4ac>0b^2 - 4ac > 0) indicate?

Two distinct real solutions

What does b2−4ac=0b^2 - 4ac = 0 indicate?

Exactly one solution (repeated root)

What does a negative discriminant indicate?

No real solutions

Which method is more useful for curve sketching?

Completing the square

How is the quadratic formula derived?

From completing the square

For −3x2−12x−7=0-3x^2 - 12x - 7 = 0, what are aa, bb, cc?

a=−3a = -3, b=−12b = -12, c=−7c = -7

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