2007-05-10 09:27:13 · 12 answers · asked by Jonathan D 2 in Science & Mathematics ➔ Mathematics
16x^2 - 25
2007-05-10 09:28:58 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The difference of two squares always takes this form -- with the terms the same except for the sign between them. Just square the first term, write a minus, then square the second term -- aka (4x)^2 is 16x^2 and 5^2 is 25. So the answer is 16x^2 - 25. All of these can be done quickly like this.
2007-05-10 18:21:30 · answer #2 · answered by Don E Knows 6 · 0⤊ 0⤋
this is called a "difference of squares".... simply F.O.I.L. (First, Inside, Outside, Last)
so:
(4x+5)(4x-5)
=(4x)(4x)+(5)(4x)+(4x)(-5)+(5)(-5)
=16x^2+20x-20x-25
=16x^2-25
2007-05-10 16:31:30 · answer #3 · answered by Anonymous · 2⤊ 0⤋
4x (4x-5) + 5 (4x-5)
16x squared-20x+20x-25
16x squared-25
2007-05-10 16:37:28 · answer #4 · answered by Aniket G 1 · 0⤊ 0⤋
the answer is 16x^2 - 25
2007-05-10 16:41:08 · answer #5 · answered by sweety 2 · 0⤊ 0⤋
Think of this to help:
Please-----parentheses
Excuse-----exponents
My-----multiply
Dear-----divide
Aunt-----add
Sally-----subtract
You have parentheses. Do those first. 4 x 5 = 20.
Do the next parenthese. 4 x -5 is -20. (4 x 5 and the -)
Now, add 20 + -20.
2007-05-10 19:33:47 · answer #6 · answered by Genevieve 3 · 0⤊ 0⤋
16x^2 - 25, coming from a math major in college...
2007-05-10 16:31:44 · answer #7 · answered by rcds23 6 · 0⤊ 0⤋
Why can't you do a problem as simple as this?
16x^2 - 25.
There you go.
Thanks for a free 2 points.
2007-05-10 16:30:51 · answer #8 · answered by Superconductive Magnet 4 · 0⤊ 1⤋
16x^2-25
2007-05-10 16:29:08 · answer #9 · answered by bruinfan 7 · 0⤊ 0⤋
16x^2 - 25 hooray, I can still do algebra :).
2007-05-10 16:34:31 · answer #10 · answered by Anonymous · 0⤊ 0⤋