Rujaxso said:Not sure where the 2ah is coming from in the middle step.
f(a+h)=-5(a+h)^2+2(a+h)-1 = -5(a^2 + 2ah +h^2) +2a +2h -1 = -5a^2 - 10ah -5h^2 +2a +2h -1
Please enlighten me
MarkFL said:When you square a binomial, the following rule applies:
\(\displaystyle (x+y)^2=x^2+2xy+y^2\)
Have you seen this rule before?
Yes, that's what the parentheses mean. $( )^2$ means you square whatever is in the parentheses. $( )^3$ means you cube what ever is in the parentheses. $\sin( )$ means you take the sine of whatever is in the parentheses. In general $f( )$ means you apply the function f to whatever is in the parentheses.Rujaxso said:Okay so instead of squaring each term I need to think about the quantity as a whole in the parenthesis as being a base for the exponent?
Rujaxso said:I guess I wanted to apply A(B+C) = AB + AC to (B+C)^2 and make B^2 + C^2 which is incorrect I see.
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