Posted by lisa on Thursday, October 13, 2011 at 9:01pm.
It would be the same way as you would do for linear simultaneous equations:
eliminate one of the variables. In this case, y is easy to eliminate.
3x^2+8x-10 = y = x^2+7x+5
Solve the resulting quadratic equation to get x=5/2 or x=-3.
As a check, substitute each of these values into the original equations to see if the values of y are equal.
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