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

This preview shows pages 1–4. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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:
-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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 5

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online