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OpenStudy (anonymous):
Solve x2 - 8x - 20 = 0
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OpenStudy (mertsj):
Could you factor it?
myininaya (myininaya):
I wonder what 2(-10) is and 2+(-10) is
jhonyy9 (jhonyy9):
x_1,_2=(8+/- sqrt(64+80))/2=(8+/- sqrt144)/2=(8+/-12)/2 = = -4/2 =-2 and 20/2 =10
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