b4-b2=90
b3=72
b5=?
b1(q^3-q)=90
b1q^2=72
b1=x
q=y
x(y^3-y)=90
xy^2=72
b1=2304/5V89+57
q=V89+5/8
b5=b1*q^4
b5= 2304/5V89+57* (V89+5/8)^4 =20520V89+197064/80V89+912
b4-b2=90
b3=72
b5=?
b1(q^3-q)=90
b1q^2=72
b1=x
q=y
x(y^3-y)=90
xy^2=72
b1=2304/5V89+57
q=V89+5/8
b5=b1*q^4
b5= 2304/5V89+57* (V89+5/8)^4 =20520V89+197064/80V89+912