Question

Se A=5x-2, determine o valor de: A²-3A+1

Answer 1

$(5x-2) ^{2} -3(5x-2)+1 \\ 25x ^{2}-35x+11 \\ Delta=1225-1100 = 125 \\ X= \frac{35 \frac{+}{-}5 \sqrt{5} }{50} \\ x'=\frac{35+5 \sqrt{5} }{50}= \frac{35+ \sqrt{5}}{10} \\ x"=\frac{35-5 \sqrt{5} }{50}= \frac{35-\sqrt{5}}{-10}$