Answers

2014-10-26T13:47:52+08:00
1. x² + 2xy + y² 2. x³ + 3x²y + 3xy² + y³ 3. 2(2-5)² = 2(4-20+25) = 2(9) = 18 4. -5 5. I don't know sorry
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2014-10-26T15:33:31+08:00

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1) (x+y)^2 \to x^2 +2xy+y^2 \\\\ 2)(x+y)^3\to x^3+3x^2y+3xy^2+y^3 \\\\ 3) 2(2-5)^2\to  2*(-3)^2=2*9\to \boxed{18} \\\\ 4) (2-3)(2+3)\to(-1)*5\to\boxed{-5} \\\\ 5)(x+y+z)^2\to x^2+y^2+z^2 +2xy+2yz+2xz
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tnx but #3 what did you use formula ?
No, i didn't use the formula, first i've made the difference 2-5= -3 ... -3 squared equal with 9 --> (-3)^2 =9.... 2 multiplied with 9 gives 18.
tnx but #3 what did you use formula ?
ahh i see .. did you now FOIL method ? this formula is use to #4