Question 170751
a) x2 + 6x - 7 = 0
(x+7)(x-1)=0
x+7=0
x=-7 ans.
x-1=0
x=1 ans.
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b) z2 + z + 1 = 0
{{{z = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}
z=(-1+-sqrt[1^2-4*1*1])/2*1
z=(-1+-sqrt[1-4])/2
z=(-1+-sqrt-3)/2
z=(-1+-1.732)/2
z=-1/2+-.866i
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I'll leave the rest for you to solve.
c) (3)1/2y2 - 4y - 7(3)1/2 = 0
d) 2x2 - 10x + 25 = 0
e) 2x2 - 6x + 5 = 0
f) s2 - 4s + 4 = 0
g) 5/6x2 - 7x - 6/5 = 0
h) 7a2 + 8a + 2 = 0