Question

Resolva as seguintes equaçoes
a- x²-100=0
b- 5x²-45=0
c- x²-9x=0
d- 2x²-16x=0

Answer 1

$a) x^{2} -100=0 \\ x^{2} =100 \\ x= \sqrt{100} \\ x=10 \\S=(10) \\ \\ \\ \\ b)5 x^{2} -45=0 \\ 5 x^{2} =45 \\ x^{2} = \frac{45}{5} \\ x^{2} =9 \\ x= \sqrt{9} \\ x=3 \\ S=(3) \\ \\ \\ \\ c) x^{2} -9x=0 \\ \\ x(x-9)=0 \\ \\ x=0 \\ \\ x-9=0 \\ x=9 \\ \\ \\ S=(0,9)$





$d)2 x^{2} -16x=0 \\ fator.comum=2x \\ 2x(x-8)=0 \\ 2x=0 \\ x=-2 \\ x-8=0 \\ x=8 \\ \\ S=(-2,8)$