Question 120707
x^2-4x-15=0 using the quadratic equation:{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
x=(4+-sqrt[-4^2-4*1*-15])/2*1
x=(4+-sqrt[16+60])/2
x=(4+-sqrt76)/2
x=(4+-8.72)/2
x=(4+8.72)/2
x=12.72/2
x=6.36 answer.
x=(4-8.72)/2
x=-4.72/2
x=-2.36 answer.
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x^2+8x-33=0
(x+11)(x-3)=0
x+11=0
x=-11 answer.
x-3=0
x=3 answer.
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I'LL LEAVE THE REST FOR YOU TO SOLVE.