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North CarolinaMathsQuick questions

Functions and Exponential Models

Quick questions on Solving quadratic equations - NC Math 1

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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Solve x2−9x+18=0x^2 - 9x + 18 = 0 by factoring. [2 points]
What is q2?
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Solve x2=50x^2 = 50 in exact form. [1 point]
What is not setting equal to zero first?
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The zero-product property needs one side to be 00. Solve x2+2x=8x^2 + 2x = 8 by writing x2+2x−8=0x^2 + 2x - 8 = 0 first.
What are quadratic-formula sign errors?
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Watch the −b-b and the b2b^2: for b=−4b = -4, −b=4-b = 4 and b2=16b^2 = 16. Substitute carefully.

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