Imaginary Numbers as Roots

Solve for x: 

• x = {-4, -1}

• x = {-1, -4}

• x = {2+i, 2-i}

• x = {-2+i, -2-i}

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

Solve for x: x² - 5x + 8 = 0

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CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

• 3 real roots, 0 imaginary roots

• 2 real roots, 1 imaginary root

• 1 real root, 2 imaginary roots

• 0 real roots, 3 imaginary roots

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CCSS.HSN.CN.C.9

This is a number such that i² = -1.

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CCSS.HSN.CN.A.1

• i

• -1

• 1

• -i

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CCSS.HSN.CN.A.1

When looking for possible imaginary/complex roots, we need to look at

• f(x)

• f(-x)

• -f(x)

• xⁿ

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CCSS.HSN.CN.C.9

All imaginary roots comes in pairs.

• True

• False

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CCSS.HSN.CN.C.9

• 5i
• -5i
• 5+i
• -5

What letter usually represent imaginary number?

• a

• i

• j

• x

• e

Answer explanation

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CCSS.HSN.CN.A.1

This is used to find the square root of a negative number.

Tags

CCSS.HSN.CN.A.1