College Algebra questions and answers

College Algebra questions and answers - 1. A. solve the...

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1. A. solve the equation 2x^2-7x-15=0 in two ways. Show all work Answer: (2x+3)(1x-5)=0 2x+3=0 x-5=0 x= -3/2 x=5 ------------------------- B. Solve the equation using the quadratic formula. Formula: x= -b±√b^2-4ac/2a 2. Solve the double inquality. Give the solution in interval notation. x-1 > 4/3(x-2) and x-4 ≤ 3x-7 answer: x-1 > 4/3(x-2) change to none fraction form 3x-3 > 4(6/2-2) 3x-3> 4x-8 x < 5
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answer is [3/2,5) 3. solve: 4(x-2)^2+8=32 answer 4(x-2)^2=24 (x-2)^2=6 x-2= ± √6 x=2 ± √6 4. Simplify. Put all complex numbers in standard form. A. √-36 answer is =6i _______ B. (3-2i)+ (-2-4i) foil answer: 3+2i+-2+-4i= 1-6i ------ C. (-2+4i)(3-i) foil answer:
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-6+2i+12i-4i^2= -2+14i 5. The total profit wallace makes from producing and spelling X gift baskets is P= .04x^2+36x How many baskets should he produce to maximize his profit? What will that profit be? Answer: Max at vertex: x= -b/2a= -36/2(-.04)= 450 baskets P= -.04(450)^2+36(450) = $8100 6. Graph the funtion f(x)= -2x^2+8x+5.
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College Algebra questions and answers - 1. A. solve the...

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