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Pearson Algebra 2 Common Core, 2011

PA

Pearson Algebra 2 Common Core, 2011 View details

Cumulative Standards Review

Exercise 2 Page 492

Recall that if i=sqrt(- 1), then i^2=- 1.

I

Practice makes perfect

We can simplify the given expression by combining like terms. Recall the definition of the imaginary unit i. i=sqrt(-1) ⇒ i^2 = -1 We will begin by using the Commutative Property of Multiplication.

9i(13i)

CommutativePropMult

Commutative Property of Multiplication

9(13)i * i

Multiply

117 i * i

ProdToPowTwoFac

a* a=a^2

117i^2

i^2=- 1

117 (- 1)

a(- b)=- a * b

- 117

This corresponds to answer I.

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