Question 231745
Please someone help me with these.  I am not sure I am doing them right.
Solve:
1. y square = 49
The square root of 49 is _7 and + 7
y = -7 and + 7

2. (z + 3) squared = 36
z squared + 9 = 36
z squared= 36-9=27= (3x3x3)
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~~~~~~~I can't go on....please help me

3. x squared + 18x - 17 = 0
x^2+18x-17=0
delta= (18)^2-4(1)(17)=256
square root of delta will be:16
therefore we will have two solutions
x= (-19-16)/2 =  -35/2
y= (-19+16)/2= -3/2

Thank you very much. Carrie