Question

PFV É PRA HOJE!!!!
RESOLVA AS INEQUAÇÕES :
a)X² - 5X 0
b)-X +2X²-3X ≤0
c)5X2-6X-82-2X 0

Answer 1

Resposta:

Boa Sorte!

Explicação passo-a-passo:

$a)\\x^2-5x=0\\x(x-5)=0\\x=0\ ou\\x-5=0\\x=5\\\\b)\\-x+2x^2-3x\leq 0\\2x^2-4x\leq 0\\2x(x-2)\leq 0\\2x\leq 0\\x\leq \frac{1}{2} \ ou\\\\x-2\leq 0\\x\leq2\\\\c)\\5x^2-6x-82-2x=0\\5x^2-8x-82=0\\\Delta=b^2-4*a*c\\\Delta= 1704 \\\\x=\frac{-b_-^{+}\sqrt{\Delta} }{2*a} \\\\x'=\frac{4+2\sqrt{426} }{5} \\\\x"=\frac{4-2\sqrt{426} }{5}$