Exercise 25 Page 239

Substitute -4 for b in the expression. When multiplying real numbers, the product will be positive if the signs are the same and it will be negative if the signs are different.

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To evaluate the given expression for b=-4, first, we should substitute -4 for b in the given expression.

b^2

Substitute

b= -4

( -4)^2

Next, we will rewrite this expression. (-4)^2=-4(-4) When multiplying real numbers, the product will be positive if the signs are the same and it will be negative if the signs are different. cc Same Sign & Different Signs (+)(+)=(+) & (+)(-)=(-) (-)(-)=(+) & (-)(+)=(-) In our case both numbers are negative, so the product will be positive.

-4(-4)

MultNegNegOnePar

- a(- b)=a* b

4* 4

Multiply

Subchapter links

Guided Practice p.236

Independent Practice p.237-238

H.O.T. Problems p.238

Standardized Test Practice p.238-240

Extra Practice p.239

Common Core Review p.240

Exercise 25 Page 239

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