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Hello, this is all to the power of two. You want to expand the entire binomial.
(5x + 4)(5x + 4)
Now use the foil method
25x^2 is the first term, can you do the other 3?
The third one?
5x * 5x
5x * 4x
4 * 5x
4 * 4
Multiply these, then add the like terms, and you're done!
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why 5x * 4x ?
and sooo .. its going to be the first one :) ... i did it but i though i was wrong
and that's where that 4*5x comes from
You have the formula \[\large (5x+4)^2\implies (5x+4)(5x+4)\]instead of using the FOIL method, you could use this formula down below, it'll work the same way \[\large a^2 +2ab+b^2\]\[\large (5x)^2+2(5x)(4)+(4)^2\]
whichever is easier for you. :)
@unheard where'd you go? -_-
Sorry. I was late for something. But thanks for helping, everyone.