Maths 911
Sunday, August 15th, 2010math! 911 in math!?
PLEASE HELP ME! I must get these answers in by today!
if you know them, then DO IT! please & thank you <3
1. Factor completely and select the correct answer.
3xy2 – 27x3
3x^2(y + 3x)(y – 3x)
3x(y + 3x)(y + 3x)
3x(y – x)(y – x)
3x(y + 3x)(y – 3x)
2. Factor completely and select the correct answer.
180x^2y – 108xy^2 – 75x^3
3x(–5x – 6y)^2
–3x(5x – 6y)^2
3x(6y – 5x)^2
3x(6y + 5x)^2
3. Factor completely and select the correct answer.
a^2 – b^2 + ac – bc
a(a + c) – b(b + c)
(a – b)(a + c)2
(a + b + c)(a – b)
(a – b + c)(a – b)
1. gcf is 3x
3x(y^2-9x^2)
3x(y+3x)(y-3x), the last one
——————————————
2. 3x(60xy -36y^2 -25x^2)
put the trinomial in order
3x(-36y^2 +60xy-25x^2) or 3x(-25x^2+60xy-36y^2 )
now since I hate to factor with the first term neg. I will factor out a negative one
-3x(36y^2 -60xy +25x^2) or -3x(25x^2 -60xy +36y^2 )
-3x(6y-5x)(6y-5x) or -3x(5x -6y)(5x-6y) , the second one
————————————————
(a+b)(a-b) +c(a-b)
gcf is (a-b)
(a-b)(a+b+c), the third one
Math Call to 911
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