Today students reviewed for their test on Factoring and Quadratic Functions. First of all, here are the answers to the review sheet from Monday's blog: Download Quadratic Test Review answers . Then students received another review: Download Mini-test on Quadratics (And Tannah gets SOTD for noting that the correct answer to #3 should be 44.) Answers to the Mini-test are:
1. D 2. E 3. 44 4. E 5. C 6. C 7. 2(x2 + 6x + 9) - 7 + 18 = 2(x + 3)2 + 11, so the vertex is (-3, 11). 8. x2 - 3x - 7x + 24 > 0, so (x - 6)(x - 4) > 0, so x < 4 or x > 6. 9. y = 4(x - 2)(x - 4) 10. (5 - 2x)(7 - 2x) = 31, so 25 - 24x + 4x2 = 31, which means 4x2 - 24x + 4 = 0, or x2 - 6x + 1 = 0. This means that x = 3 plus or minus 2 sqrt (2) or approximately 5.828 or .1716 .The first one is too large, so the width of the sidewalk is .1716 dkm wide.
