Could someone please help with these problems?

Question

4x squared-5x + 3
if is a.3 b. 0.3

Please show me the work invovled on getting the answer, my teacher requests it. Thank you.

Answer 1

Where is the equal sign?
If you mean:
4 x^2 - 5 x + 3 = 0
then
(x-3)(4x-1) = 0
and
x = 3 or x = .25

Answer 2

Sorry I meant to put

4x - 5x + 3
if x is a. 3 and then b. 0.3