identify the solutions to the equation when you solve by completing the square
Stacey Warren - Expert brainly.com
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4x^2- 20X+25= 0 Make two sets of parenthesis. because x is squared, x will be the start of both parenthesis (x ) (x ). it's either 4, 1 or 2, 2 for before the X's. ( one number for each, using the fact tree idea) .. continuing
guessing which goes where is the fight next. if
(2x- ) (2x+ ) then that would = 4x^2 the "outers" are next. the last two "outers have to be multiplied to get 25, but add up to the 20.
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so, the factors of 25 are ( 1,5, 25) any others?
ok, so it looks like 2 and 2 won't work. try 4 and 1
(4x-5) (x+5). = 4x^2 +20x- 5x-25= 4x^2+15X-25 This is close!!
Now we need to change the signs in the middle, they don't work.
a. -2.5, 2.5
d.no real solutions
(4x-5) (x-5) =4x^2-20x-5x+25= 0 4x^2-25x=-25
Wish I had known you HAVE the answers.. You just needed to plug them in to see if they work!! lol But now you can see how to work through the problem... Enjoy!
what is the answer?
How old are you? Have you done this before?
PLug in the numbers ( choices) as X and see if they work.