Question 71233
X^2-4X-5=0
(X-5)(X+1)=0
X-5=0
X=5 ANSWER
X+1=0
X=-1 ANSWER
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X=(4+-SQRT[-4^2-4*1*-5])/2*1
X=(4+-SQRTR[16+20])/2
X=(4+-SQRT36)/2
X=(4+-6)/2
X=(4+6)/2
X=5 ANSWER
X=(4-6)/2
X=-2/2
X=-1 ANSWER