Question 60064
y= -2(x^2+10x+29) 
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Google would show you the formula, but here it is:
x=[-b+-sqrt(b^2-4ac)]/(2a)
Fo your problem:
x=[-10+-sqrt(100-4(1)(29)]/(2)
x=[-10+-sqrt(-16)]/2
x=[-5+-2i]
x=-5+2i or x=-5-2i
Cheers,
Stan H.