any help would be much appreciated
thanks
expand and simplify (5x - 3)^2?
2009-01-05 2:50 pm
回答 (5)
2009-01-05 2:58 pm
✔ 最佳答案
(5x-3)^2=(5x-3)(5x-3)
=25x^2-15x-15x+9
=25x^2-30x+9 answer//
2009-01-05 11:04 pm
(5x - 3)^2
= (5x - 3)(5x - 3)
= 5x*5x - 3*5x - 5x*3 + 3*3
= 25x^2 - 15x - 15x + 9
= 25x^2 - 30x + 9
= (5x - 3)(5x - 3)
= 5x*5x - 3*5x - 5x*3 + 3*3
= 25x^2 - 15x - 15x + 9
= 25x^2 - 30x + 9
2009-01-05 11:01 pm
square the front, double the product, and square the back is your rule of logic..
front = 5x ... square 5 you get 25 and 'x' squared
double the product of 5x and (-3) .... -15x times 2 is (-30x)
square the back: (-3)(-3) = 9
Answer is 25x^2 - 30x + 9
front = 5x ... square 5 you get 25 and 'x' squared
double the product of 5x and (-3) .... -15x times 2 is (-30x)
square the back: (-3)(-3) = 9
Answer is 25x^2 - 30x + 9
2009-01-05 10:53 pm
25x^2 - 30x + 9. Hope that helped =D
2009-01-05 10:53 pm
just write it out
=(5x-3)(5x-3)
=25x^2 - 15x -9
=(5x-3)(5x-3)
=25x^2 - 15x -9
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