Algebra

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Rewrite the middle term as the sum of two terms and then factor completely.
25x^2+35x+12

Is the following true or false?
x^2+2x-3=(x+1)(x-3)

Can you show me how to do these two problems?
Thank you for any help you can give me.

If the middle is the sume of 20 x and 15 x ...
25x^2+35x+12
25x^2+20x + 15x+12
5x(5x + 4) + 3(5x+4)
(5x+3)(5x+4)...

does -3 and 1 add to +2?

If the middle is the sume of 20 x and 15 x ...
25x^2+35x+12
25x^2+20x + 15x+12
5x(5x + 4) + 3(5x+4)
(5x+3)(5x+4)...

does -3 and 1 add to +2?

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