Wednesday

October 22, 2014

October 22, 2014

Posted by **Brittney Hoang** on Wednesday, March 28, 2012 at 10:16pm.

The triangle bounded by the lines y = 0, y = 2x and y = -0.5x + k, with k positive, is equal to 80 square units. Find k.

When the polynomial P(x) = x3 + 3x2 -2Ax + 3, where A is a constant, is divided by x2 + 1 we get a remainder equal to -5x. Find A.

And would like to see work that can justify the answer. Thank you!

- Advanced Math -
**MathMate**, Wednesday, March 28, 2012 at 10:46pmHints:

(a)

find the radius r which corresponds to the distance between (-3,-2) and (0,-6). Then

(-3-a)^2+(-2-0)^2 = r^2

(b)

y=0 is horizontal (1)

y=2x (2) is a line through the origin sloping upwards

y=-0.5x+k (3) is a line sloping downwards with x-intercept: -0.5x+k=0, or x=2k.

You'll need to find the intercept between lines (2) and (3) and determine the height of the triangle.

(3)

This means that (x^2+1) divides P(x)-5x, or

P(x)-5x = (x^2+1)(x+3)=

=x^3+3*x^2+x+3

Therefore

P(x)=x^3+3*x^2+x+3 + 5x

=x^3+3*x^2+6x+3

=> A=-3

**Answer this Question**

**Related Questions**

Advanced Math - Write the standard form of the equation of a circle that passes ...

Equations of a Circle - Write the standard for of the equation of the circle ...

Math - Write the standard for of the equation of the circle that passes through ...

Algebra II - Find the radius and center of the circle which passes through the ...

MATH!!!! - A triangle with side lengths 26, 28, and 30 is constructed so that ...

math_pre-calc - Find the equation of a circle that passes through the points (6,...

Advanced Math - write the equation of the circle that satisfies each set of ...

math - can u help this the qustion is : A circle passes through the points (1,4...

Math 101 - Find the equation for each of the following items below: a. A line ...

geometry - Prove: if th bisector of an angle whose vertex lies on a circle ...