algebra

simplify (5x-4)^2

I got 25x^2 -16

is that right?

  1. 👍 0
  2. 👎 0
  3. 👁 131
asked by sara
  1. If you worked according to the FOIL rule, you would expect 4 terms, which simplify to 3 in this case.

    A standard identity for the square of a binomial is as follows:

    (a+b)²
    =a²+2ab+b²
    so
    (5x)²= 25x²
    2(5x)(-4)=-40x
    (-4)²=+16

    So altogether:
    (5x-4)²=25x²-40x+16

    1. 👍 0
    2. 👎 0
  2. okay thanks :)

    1. 👍 0
    2. 👎 0
    posted by sara
  3. how to solve .25x + 2 = 12

    1. 👍 0
    2. 👎 0
    posted by mary
  4. .25x+2=12
    -2 -2
    ------------
    .25x=10
    --------
    .25 .25

    x=40

    1. 👍 0
    2. 👎 0
    posted by Carlie

Respond to this Question

First Name

Your Response

Similar Questions

  1. Algebra

    1. Find the degree of the monomial 6p^3 q^2. A) 2 B) 3**** C) 5 D) 6 2. Simplify (7t^2+9)+(6t^2+8) A) t^2 +1 B) 13t^2+17 C) 13t^4+ 17**** D) 42t^2+72 3. Simplify 3n(4n^2 + 5n) A) 12n^3 + 15 n^2***** B) 7n^2+8n C) 12n^2 +15n D)

    asked by Olaf on February 12, 2015
  2. Algebra

    Simplify and write with positive exponet (4x^-1)^-1 Work: (1/4x)^-1 (1/(1/4x))(4x/4x)= 1 (X^3+3x^2+3x+1)^-2/3 Work 1/(X^3+3x^2+3x+1)^2/3 1/(X^2+52/25x^4/3+52/25x+1) I'm confused on whether these are right or not can someone check

    asked by Yaga on August 16, 2016
  3. Algebra 1

    Simplify using long division. (remember to show all your work.) 3. (72-8x^2+4x^3-36x)/(x-3) 4. (8b^3-6)/(2b-1) simplify the expression, if possible. state the excluded values, if any. 5. 10x^2-25X+15^5x-5 6.2w^2-18^w^2+6w+9

    asked by Natalia on January 13, 2017
  4. someone help

    my post is still on this page as algebra, could someone elaborate on what bobpursley tried to help me with. See your original post. I am guessing you are referring to your question 5)Simplify:(5x-4)^2 and your answer= 25x^2 - 16

    asked by erin on August 1, 2007
  5. Urgent Math please check

    Very Important I can get someone to check these for me... I have to get an A, and I was wondering if someone could double check these for me. I am about 95% sure they are right, but just need a fresh set of eyes. I know I've been

    asked by Brittany on April 2, 2011
  6. Polynomial- Doublecheck2

    I asked this earlier, but I didn't get an answer. I'm glad though, because I found a couple of typos. I can get someone to check these for me... I have to get an A, and I was wondering if someone could double check these for me. I

    asked by Brittany on April 3, 2011
  7. Calc again sorry

    4) The graph of y = (x)/(1+25x^2) for x is greater than or equal to 0 has a horizontal tangent at x = what. So what I did was find the first derivative. I did the quotient rule and ended up with x50x - 1+25x^2 ---------------

    asked by Samantha on November 5, 2008
  8. algebra

    1)Simplify:(3x^0y^-4)(2x^2y)^3 answer=6x^6 over y 2)Simplify:2x^2y^5z^-4 over 8x^6yz^3 answer= y^4 over 4x^4z 3)Saturn is 1.4 x 10^9 kilometers away from the sun. If light travels 3.0 x 10^4 km per second,how long does it take

    asked by erin on August 1, 2007
  9. math

    The graph of a reciprocal function of the form f(x)=1/ax+b where a is not equal to 0 and b is not equal to 0. Which is the equation of the original function f (x)? a)y=5.25x-2 b)y=-5.25x+2 c)y=-5.25x-2 d)y=5.25x+2

    asked by Alex on January 15, 2015
  10. math

    simplify (25x^2)^1/2( one over two)

    asked by ashley on January 25, 2009

More Similar Questions