Question

$-7+9x^(4)-3x^{2} +8x^{2}$

Answer 1

Respuesta:

4x = 90 - x/2

4x = (90 * 2 - x)/2

4x = (180 - x)/2

2 (4x) = 180 - x

8x = 180 - x

8x + x = 180

9x = 180

x = 180/9

x = 20

Solucion

x= 20