Question 192288
1) Solve by factoring:
x^2 - 9x = -20 
x^2 - 9x + 20 = 0
(x-5)(x-4) = 0
x = 5 or x = 4
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2) Solve using the quadratic formula:
3x^2 - 2x = 15x - 10 
3x^2 -17x + 10 = 0
x = [17 +/- sqrt(17^2 - 4*3*10)]/6
x = [17 +/- sqrt(169)]/6
x = [17 +/- 13] 6
x = 5 or x = 2/3
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3) Solve using the quadratic formula:
x^2 - 3x - 23 = 5 
Same process as above.
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Cheers,
Stan H.