Algebra

posted by .

Can anyone please check the following for me please

Expand (5 - 2x) Squared

(5 - 2x) (5 - 2x)

5 sqrd + 5 X - 2x + -2x x 5 + -2x X -2x

so

5 Sqrd - 10x - 10x + 4X

= 5 sqrd + 4x

Am I right..thank you :-)

  • Algebra -

    No, you should use FOIL
    F - multiply the Firsts
    O - multiply the Outers
    I - multiply the Inners
    L - multiply the Lasts

    so (5 - 2x) (5 - 2x)
    = (5)(5) + (5)(-2x) + (-2x)(5) + (-2x)(-2x)
    = 25 - 20x + 4x^2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. algebra

    simplify by combining like terms: x sqrt(18) - 3 sqrt(8x)sqrd If <sqrt(8x)sqrd> means [sqrt(8x)]^2, then that also equals 8x. So x sqrt(18) - 3 sqrt(8x)sqrd = x[sqrt(9*2)-3*8] = 3x(sqrt 2 -3
  2. Algebra

    If anyone could please just look these over: The given measures are the perimeters of squares. Find (a) the length of a side and (b) the area of the square. Perimeters: 1.) 20 cm 2.) 100mm 3.) 4ft 4.) 2in 5.) 2.8m My answers: 1.) a- …
  3. College Algebra

    Can someone check my answer please! I'm not sure this is right x(squared)+7x+10=0 (x+r)(x+s) =x(squared)+sx+rx+rs =x(squared)+(r+s)x+rs x(squared)+(r+s)x+rs=x(squared)+7x+10 r+s=7 rs=10 (2)(5)=10 and 3+4=7 x(squared)+7x+10=(x+5)(x+2)
  4. math

    i am having a minor difficulty i've been stuck for over an hour and don't know what to do i don't know is this right ?
  5. algebra

    Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 …
  6. algebra

    Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 …
  7. Algebra-Please check

    Please check- sqrt of 2x + 15 = x Answers: -5.3 -3.5 -3 5 I think according to my calculations it would be 5, correct?
  8. algebra 2 multiple choice HELP

    find f(a), if f(t) = 2t2(squared)-t-2 A. 2(a+t)2(squared)-2t+1-2 B. 2(t+a)2(squared)-2(t+a)-2 C. 2a2(squared)-a-2 D. 4a2(squared)-2a-2 I put (squared) because the two in front of it means it's being squared... please help. thanks!
  9. 10th Grade Algebra

    Please help me with these factorise algebra questions!!! 1. 9c squared + 30c + 25 - 4d squared 2. 12 + 89 - 4a squared 3. -5x squared + 27x - 10 4. If A= 15x squared - 20x +11 and B= 1 + 9x+ 5x squared, then A-B when factorised is...
  10. Calculus

    We just learned derivatives and now on the Chain Rule. y = r/[(sqrt)(r(sqrd)+1)] y' = [[(sqrt)(r(sqrd)+1)(r)'] - [(r)(sqrt)(r(sqrd)+1)']] / [(sqrt)(r(sqrd)+1)](sqrd) y' = (sqrt)(r(sqrd)+1) - r[1/2(r(sqrd)+1)(raised to -1/2)](2r) My …

More Similar Questions