# Support1 - x = 21 2 x &amp;amp;amp; (5 + x ) = 16...

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Support Class 1. Question 1. Note that (a+b)(c+d) can be expanded as ac + ad + bc + bd: Expand each of the following expressions: (i) (x+y) 2 ; (ii) (x-y) 2 (iii) (3x+2y) 2 (iv) (1-2z) 2 (v) (4p+5q)(4p-5q). Question 2. Noting that the expression a 2 + ab can be factorized as a(a+b) ; factorize each of the following: (i) 5x 2 + 15 x; (ii) -18b 2 + 9 ab (iii) K (1 + r ) + rK (1 + r ) (iv) a 2 + 2 ab + b 2 : Question 3. Solve the following equations for x 5 x 10 = 15 2 x 3 = 8 3
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Unformatted text preview: x = 21 2 x &amp; (5 + x ) = 16 &amp; (3 x + 9) &amp; 5(3 x &amp; 2) = 16(1 &amp; x ) 1 x = 3 4 1 x &amp; 1 = 3 4 1 x &amp; 1 = 1 3 x + 2 x x + 1 = 2 x &amp; 3 x + 3 = x &amp; 4 x + 4 Question 4. A standard Keynesian model implies Y = C + I C = A + 0 : 8 Y where A; I are positive numbers describing autonomous consumption and gross investment respectively. These equations imply Y must satisfy Y = A + 0 : 8 Y + I: Solve for Y: Why does a £ 1 increase in I imply GDP increases by £ 5? 1...
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## This note was uploaded on 12/31/2011 for the course ECON MR 102 taught by Professor Huyduong during the Winter '11 term at RMIT Vietnam.

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