Question

(x-5). (x+2) sendo x maior que zero

Answer 1

x²+2x-5x-10  
podendo ser biquadrada 

Answer 2

x²+2x-5x-10=0
x²-3x-10=0
a=1, b= -3, c= -10
▲= b²- 4ac
▲ = (-3)²- 4×1×(-10)
▲ = 9+40
▲ = 49

x= -b+- √▲/2a
x= -(-3) +- √49/2.1
x= 3+-7/2
x1= 3+7/2=10/2=5
x2= 3-7/2= -4/2= -2