Hi,
I have an exam in the next couple of days that I am really not looking forward to.
Can anyone explain to me how the 6.8CR is derived in the following sum?
I see how we get to 13, but 6.8CR is a mystery to me.
Thanks,
TK
Expand the brackets (I'm goin to use $\displaystyle x = C_R$. It's easier to type:
$\displaystyle (2 - 0.8x)^2+(-3+0.6x)^2=4-3.2x+0.64x^2 + 9 - 3.6x + 0.36x^2$
Collect like terms and you'll get the given result.
Probably you missed that
$\displaystyle (2-0.8x)^2 = (2-0.8x)(2-0.8x)$