Please help me factoring these polynomial problems...?

Question

1. (2x-4)(3x-5)=0

2. m(2m+7)(3m-4)=0

3. d^= 14d-45

4. h^= -3h+54

Answer 1

2x-4=0 3x-5=0 x=2 x=5/3

m=0 2m+7=0 3m-4=0
m-0 m=-7/2 m=4/3

d-5 d-9 d=5 d=9

(the first question can be done quadratically) if it is -54
(x-9)(x+6) x=9 x=-6

Answer 2

1)(2x-4)(3x-5)=0
2x-4=0
2x=4
x=4/2
x=2
or
3x-5=0
3x=5
x=5/3

so x=2,5/3

2)m(2m+7)(3m-4)=0
m=0
or

2m+7=0
2m=-7
m=-7/2
or

3m-4=0
3m=4
m=4/3

so m=0 or -7/2 or 4/3

3)d^= 14d-45
d^2= 14d-45
d^2-14d+45=0
d^2-9d-5d+45=0
d(d-9)-5(d-9)=0
(d-9)(d-5)=0
d-9=0
d=9

or
d-5=0
d=5
so d=9 or 5

4)h^= -3h+54
h^2+3h-54=0
h^2+9h-6h-54=0
h(h+9)-6(h+9)=0
(h+9)(h-6)=0
h+9=0
h=-9

or
h-6=0
h=6

so h=-9 or 6