Question 231745
Solve:
1. y square = 49
The square root of 49 is -7 or + 7
y = -7 or  + 7 
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2. (z + 3) squared = 36
The square root of 36 is -6 or +6
z+3 = 6 or z+3 = -6
z = 3 or z = -9
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3. x^2 + 18x - 17 = 0
This problem requires use of the Quadratic Formula.
If you are familiar with it, use it to get:
x = [-18 +- sqrt(18^2-4*1*-17)]/2
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x = [-18 +- sqrt(392)]/2
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x = [-18 +- 19.8]/2
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x = 1.8/2 or -37.8/2
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Final Ans: x = 0.9 or x = -18.9
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Cheers,
Stan H.