Quadratic formula Lesson

6 Slides • 3 Questions

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Quadratic Formula CW page 82

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Multiple Choice

Determine the values of
a, b, and c for
the quadratic equation:
4x² – 8x = 3

1

a = 4, b = -8, c = 3

2

a = 4, b =-8, c =-3

3

a = 4, b = 8, c = 3

4

a = 4, b = 8, c = -3

8

Multiple Choice

$2x^2=8x+3$

2x^2-8x-3=0

x=\frac{8\pm\sqrt{64-4\left(2\right)\left(-3\right)}}{4}

x=\frac{8\pm\sqrt{40}}{4}

x=\frac{8\pm2\sqrt{10}}{4}

x=\frac{4\pm\sqrt{10}}{2}

Suzanne solved the equation using this process.

Did she make a mistake?

If yes, at which line did she make her first mistake?

(There are 5 steps in her process)

1

Suzanne made no errors.

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Step 2

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Step 3

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Step 4

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Step 5

9

Multiple Choice

$3x^2-10x+1=0$

Solve using the quadratic formula. Leave your answer in exact form.

1

$x=\frac{-10\pm\sqrt{88}}{6}$

2

$x=\frac{-5\pm2\sqrt{22}}{3}$

3

$x=\frac{10\pm\sqrt{112}}{6}$

4

$x=\frac{5\pm\sqrt{22}}{3}$

Quadratic Formula CW page 82

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