Question

Factor the expression 4x^2-28x+49

Answer 1

What did you get for your answer?

Answer 2

First notice that there is no common factor in all three terms.
Look at the first term: 4x^2. Is this the square of something?
Look at last term: 49. Is this the square of something?

Answer 3

consider it 4x^2-28x+49 in this way (2x)^2 -2(7x)(2) +(7)^2
it becomes (2x-7)^2