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Expressions and Operations

Quick questions on Equivalent expressions and structure - Virginia SOL Algebra I

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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Is 4(xβˆ’2)+84(x - 2) + 8 equivalent to 4x4x? [1 point]
What is q2?
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Write (xβˆ’5)(x+5)(x - 5)(x + 5) in standard form. [1 point]
What is a single test value proves equivalence?
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Matching at x=1x = 1 does not guarantee equivalence; expressions can agree at one point by chance. Simplify, or test a second value.
What is sign error when distributing a negative?
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3βˆ’2(xβˆ’1)=3βˆ’2x+2=5βˆ’2x3 - 2(x - 1) = 3 - 2x + 2 = 5 - 2x, not 1βˆ’2x1 - 2x.

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