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Pearson Algebra 1 Common Core, 2011 View details

5. Completing the Square

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Exercise 64 Page 581

Substitute 2 for a, 5 for b and - 7 for c in the given expression.

81

Practice makes perfect

To evaluate the given expression for a = 2, b = 5 and c = - 7, we should substitute these values into the expression and simplify as much as possible.

b^2 - 4ac

SubstituteValues

Substitute values

(5)^2 - 4(2)(- 7)

CalcPow

Calculate power

25 - 4(2)(- 7)

Multiply

25 - 8(- 7)

MultNegNegOnePar

- a(- b)=a* b

25 + 56