Question

solve the following equation by quadratic formula
$5x {}^{2} - 8x - 4 = 0$
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Answer 1

5x²-8x-4=0

-20x² = -10x * 2x

5x²-10x+2x-4 =0

5x(x-2) +2(x-2) =0

(5x+2)(x-2) = 0

x=2,

x= -2/5