b1=b5/q^4 S10=b1(q^10-1)/q-1
b1=-9/-81 S10=1/9(-3^10-1)/-3-1
b1 =1/9 S10=1/9*(-59050)/-4
S10=-59050/9*(-1/4)
S10=59050/36
y = - 4x + 12
y = 0
- 4x + 12 = 0
- 4x = - 12
x = 3