Make it equal zero by subtracting 21x from both sides.
20x2 - 21x - 5 factors to (4x - 5)(5x + 1)
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x+20x = 60000 21x = 60000 x = 60000/21 = 2857.'142857' recurring
It is: 3x*(x+7)
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x2 - 21x = 72x2 - 21x - 72 = 0(x - 24) (x + 3) = 0x = 24x = -3
(5x-6)(x-3)