Question

equaçao biquadrada -3x^4+75=0 7x^4+14x^2=0 -3x^4+300=0 5x^4+10x^2=0 respostas pf

Answer 1

- 3x^4 + 75 = 0
3x^4 - 75 = 0
3x^4 = 75
x^4 = 75/3 = 25 = 5² 
x^4 = 5² 
x² = +- 5
x = +-V5  
2
7x^4 + 14x² = 0
7x²( x² + 2) = 0
7x² = 0
x² = 0/7 = 0
x = 0 ****
x² + 2 = 0
x² = -2   
x = V-2  ( raizes  impossiveis)
3
-3x^4 + 300 = 0
3x^4 - 300 = 0
3x^4 = 300
x^4 = 300/3 = 100
x^4 = 2² * 5²
x² = 2 * 5 = 10
x = +-V10
4
5x^4 + 10x² = 0
x^4 + 2x² = 0
x² ( x² + 2) = 0
x² = 0
x = 0 *****
x² + 2 = 0
x² = - 2 
x = +-V2   ( só  vale o valor positivo )  x = +V2 ****