# How do you simplify the expression #7x^2-4y+3x^2+5y+2# and evaluate it for x+3 and y=9?

##### 1 Answer

Apr 27, 2017

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#### Explanation:

Assuming this is all equal to 0, we add like terms

We can then isolate one of the variables, usually

To evaluate it for

To solve for

We can use the quadratic formula to get the solutions

This results in undefined so there are no real solutions.

For

This is also undefined, so there are no real solutions.