roots and coefficients of a quadratic equation (solve each quadratic equation by quadratic formula )
1.) x²-16x+64=0
2.) x²+18x+81=0
3.) x²-64=0
4.) 2x²+x=28
5.) 2x²-9x+20= -5
1.) x²-16x+64=0
2.) x²+18x+81=0
3.) x²-64=0
4.) 2x²+x=28
5.) 2x²-9x+20= -5
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2. X=-9
3. X1= -8, X2=8
4. X1= -4, X2=3.5