Question

RESOLVA AS EQUAÇÕES DE 2* GRAU, COMPLETAS OU INCOMPLETAS, DETERMINANDO O VALOR DA VARIÁVEL( FAZENDO BHASKARA NO CADERNO) , EM CADA CASO:

3x² – 7x + 4 = 0

– 3x² + 18x – 15 = 0.

(x + 3)² = 1
Me ajudem pfv

Answer 1

$3x^2-7x+4=0\\\\x_{1,\:2}=\frac{-\left(-7\right)\pm \sqrt{\left(-7\right)^2-4\cdot \:3\cdot \:4}}{2\cdot \:3}\\\\x_{1,\:2}=\frac{-\left(-7\right)\pm \:1}{2\cdot \:3}\\\\x_1=\frac{-\left(-7\right)+1}{2\cdot \:3},\:x_2=\frac{-\left(-7\right)-1}{2\cdot \:3}\\\\x'=\frac{4}{3} \hspace{8}\:x''=1$

=======================

$-3x^2+18x-15=0\\\\x_{1,\:2}=\frac{-18\pm \sqrt{18^2-4\left(-3\right)\left(-15\right)}}{2\left(-3\right)}\\\\x_{1,\:2}=\frac{-18\pm \:12}{2\left(-3\right)}\\\\x_1=\frac{-18+12}{2\left(-3\right)},\:x_2=\frac{-18-12}{2\left(-3\right)}\\\\x'=1,\:x''=5$

=======================

$\left(x+3\right)^2=1\\\\\mathrm{Para\:}\left(g\left(x\right)\right)^2=f\left(a\right)\mathrm{\:as\:solucoes\:sao\:}g\left(x\right)=\sqrt{f\left(a\right)},\:\:-\sqrt{f\left(a\right)}\\\\x'=-2,\:x''=-4$