Question

Me ajudem, Urgente...
e pra entregar amanhã!​

Answer 1

Resposta:

Boa Sorte!

Explicação passo-a-passo:

$65)\\a)x^2-7x+10\\b)x^2+x-20\\c)x^2-2x+1\\d)x^2-2x\\\\66)K=-1\\\\67)m=6\\\\68)\\a)x+x^2\\b)(2x)^2-\frac{x}{2}\\c)(3x)^2-\frac{x}{2}\\d)\frac{x^2}{2}\\\\69)x+x^2-56=0\\\Delta=b^2-4*a*c\\\Delta=1^2-4*1*(-56)\\\Delta=1+224\\\Delta=225\\\\x=\frac{-b^+_-\sqrt{\Delta} }{2*a}=\\\\x=\frac{-1^+_-15}{2}= x'=7 \ e \ x"=-8$

$70)\\x^2+2x-35=0\\\Delta=2^2-4*1*(-35)\\\Delta=4+140\\\Delta=144\\\\x=\frac{-2^+_-12}{2}=x'=5 \ e \ x"=-7$

$71)\\-x^2+3x-2=0\\\Delta=3^2-4*(-1)*(-2)\\\Delta=9-8\\\Delta=1\\\\x=\frac{-3^+_-1}{-2}=x'=1 \ e \ x"=2\\\\72)\\x^2+2x-48=0\\\Delta=2^2-4*1*(-48)\\\Delta=4+192\\\Delta=196\\\\x=\frac{-2^+_-14}{2}=x'=6 \ e \ x"=-8$