(2x +3) (x+7)
neg(p -> q) =p^ neg q
$8x^{2}$ +216=0
2x+3= $\frac{\x}{\5}$
(2x +3) (x+1)
x-6y=10
3y^2=4x+1
give them to 1 d.p
16+24=8(2+ )
8x-2y=100
a-ab