Question

7x²-14=0 me ajudemm tambem -x²+49=0 -25+100x²=0 x²-81/4=0 aaa me ajuda

Answer 1

$7x^2-14=0 \\ 7x^2=14\\x^2=2 \\ x=\sqrt{2}\; ou \;\;x=-\sqrt{2}\\ \\-x^2+49=0 \\ x^2=49 \\ x=7\; ou \;\;x=-7 \\ \\ -25+100x^2=0 \\100x^2=25 \\ x^2=1/4 \\ x=1/2\; ou \;\;x=-1/2 \\ \\x^2-81/4=0 \\ x^2=81/4 \\ x=9/2\; ou \;\;x=-9/2$

Answer 2

7x²-14 = 0
7x² = 14
x² = 14/7
x² = 2
x = +/-√2

-x²+49 = 0 .(-1)
x² - 49 = 0
x² = 49
x = +/-√49
x = +/-7

-25+100x² = 0 
100x² - 25 = 0
100x² = 25
x² = 25/100
x = +/-√(25/100)
x = +/-(5/10)

x² - 81/4 = 0
x² = 81/4
x = +/-√(81/4)
x = +/-(9/2)