a summary of the formulas in calculus, algebra homework help

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ALGEBRA

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IF X^2 + 4Y^2 = 40 and XY=6, what will be the value of X+2Y?

Solution
We have two equations
X^2 + 4y^2 =40------a
XY = 6-------b

We can use equation b to find a
If XY =6, then that means x = 6/y
And so x^2 = (6/y) ^2 this gives us
36/y^2
Substituting this in our e...


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