My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum

LinkBack Thread Tools Display Modes
February 4th, 2014, 06:04 AM   #1
Senior Member
Joined: Sep 2013
From: Earth

Posts: 827
Thanks: 36

Graph of function.

How to do part c?
Attached Images
File Type: jpg 1536547_820858174595952_1296242247_n.jpg (103.3 KB, 98 views)
jiasyuen is offline  
February 4th, 2014, 07:48 AM   #2
Math Team
Joined: Sep 2007

Posts: 2,409
Thanks: 6

Re: Graph of function.

You are told that "the area of the shaded region is " and asked to (i) "find the value of x given that the area of the shaded region is 52 sq cm" and (ii) "given that the area of the shaded region is 1.4".

So you want to solve the equations and .

Subtracting 52 from both sides of the first equation you get and then divide by 2 to get . Solve that quadratic equation.

The second equation is equivalent to . Solve by completing the square or by the quadratic formula.
HallsofIvy is offline  
February 4th, 2014, 07:58 AM   #3
Global Moderator
Joined: Dec 2006

Posts: 20,652
Thanks: 2085

(c)(i)  It would seem you are supposed to solve 2x˛ - 12x + 48 = 52. However, it appears from the diagram that the shaded area cannot exceed 48 cm˛.

(c)(ii) You should be able to evaluate (2x˛ - 12x + 4 cm˛ for x = 1.4.
skipjack is offline  

  My Math Forum > High School Math Forum > Algebra

function, graph

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Graph of function sachinrajsharma Algebra 2 February 24th, 2013 10:24 AM
How to graph this function? hlecok Algebra 1 September 5th, 2012 09:05 AM
function graph safyras Algebra 1 January 2nd, 2012 12:22 PM
Function: Graph ChristinaScience Calculus 7 October 9th, 2011 11:35 AM
Graph of function mikeportnoy Algebra 3 March 10th, 2009 06:35 AM

Copyright © 2019 My Math Forum. All rights reserved.