Question

acha o valor de x? c)3(x²-1)=24 d)2(x²-1)=x²+7

Answer 1

c) x² - 1= 24/3 

x² - 1 = 8 

x² = 8 + 1

x² = 9 

x = √9 

x= 3


d)  2(x²-1)=x²+7

2x² -2 = x² + 7

2x² - x² -2 -7=0

x² - 9 =o

x² = 9

x= 3