Question 320286
(a) x^2+8x=-16 (b) 3x^2=2x+5 
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x^2+8x+16 = 0
3x^2- 2x -5 = 0 
3x^2+24x+48 = 0
----------------  Subtract
-26x - 53 = 0
x = -53/26
------------- That's not right
x^2 + 8x + 16 = 0
4x^2- 8x - 20 = 0
-------------------Add
5x^2 = 4
x = ± 2sqrt(5)/5
------------- That's not right either
x^2+8x+16 = 3x^2- 2x -5
2x^2 - 10x - 21 = 0
*[invoke solve_quadratic_equation 2,-10,-21]
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That's right.