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kobusy [5.1K]
2 years ago
14

7b^2 - 14b - 56 = 0 Solve by completing the square

Mathematics
1 answer:
Yakvenalex [24]2 years ago
5 0

Answer: <em>7(b-1)^2-63</em>

Step-by-step explanation:

Factor out 7

<em>7(b^2-2b-8)</em>

Add and subtract (-1)^2:

<em>7(b^2-2b-8+(-1)^2-(-1\)^2)</em>

Complete the square:

<em>7((b-1)^2-8-(-1)^2)</em>

<em />

Simplify:

<em>7(b-1)^2-63</em>

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The number property that will justify the step in the following expression. 2(5 • 17) = (2 • 5) 17 = 10 • 17 = 170 is; Associative Property

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The associative property is a math rule that says that the way in which factors are grouped in a multiplication problem does not change the product.

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