Comments on: Multiplication, Addition of Exponents http://mathmojo.com/chronicles/2007/05/23/multiplication-addition-of-exponents/ The Official Blog of MathMojo.com - helping public school, homeschooling, unschooling students, parents, teachers and adults learn math with easy and effective methods. Tue, 06 Jan 2009 02:55:01 +0000 http://wordpress.org/?v=2.7 hourly 1 By: RandallJones http://mathmojo.com/chronicles/2007/05/23/multiplication-addition-of-exponents/comment-page-1/#comment-8185 RandallJones Sun, 17 Jun 2007 16:59:54 +0000 http://mathmojo.com/chronicles/2007/05/23/multiplication-addition-of-exponents/#comment-8185 For the first problem, you can also can solve the problem without substitution. (x+y)^2= x^2 + 2xy + y^2 which is obviously greater than x^2 + y^2, that is if x and y are both greater than zero. But you say to substitute any real numbers and if either x or y is negative, than the reverse would be true, x^2 + y^2 would be the larger algebraic expression. For the first problem, you can also can solve the problem without substitution.
(x+y)^2= x^2 + 2xy + y^2 which is obviously greater than x^2 + y^2, that is if x and y are both greater than zero.

But you say to substitute any real numbers and if either x or y is negative, than the reverse would be true, x^2 + y^2 would be the larger algebraic expression.

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