document.write( "Question 978234: Please help me. I can't answer these problems
\n" ); document.write( "1. (-5x³y⁴)(-5x³yz)
\n" ); document.write( "2. (x^9 - y^5)(x^9 + y^5)
\n" ); document.write( "3. (a - b)(a² - ab + b²)
\n" ); document.write( "4. (4x - 3y)(16x² - 12xy + 9y²)
\n" ); document.write( "5. (2a - 7y)² \n" ); document.write( "
Algebra.Com's Answer #599705 by Boreal(15235)\"\" \"About 
You can put this solution on YOUR website!
1. (-5x³y⁴)(-5x³yz)=25x^6y^5z Multiply the constants first, then the x terms, adding the exponents, then the y terms, and then the z terms.
\n" ); document.write( "2. (x^9 - y^5)(x^9 + y^5) FOIL x^18 (first) +x^9y^5 (outer)-x^9y^5 (inner)-y^10 (last)= x^18-y^10, since the second and third terms cancel each other.
\n" ); document.write( "3. (a - b)(a² - ab + b²) first and second terms by each of the 3 terms; there are 6 altogether:
\n" ); document.write( "a^3-a^2b+ab^2-a^2b+ab^2-b^3=a^3-2a^2b+2ab^2-b^3. Look for like terms, and there are two terms, a^2b and ab^2, that have two.
\n" ); document.write( "4. (4x - 3y)(16x² - 12xy + 9y²)=20x^3-48x^2y+36xy^2-48x^2y+36xy^2-27y^3=
\n" ); document.write( "20x^3-96x^2y+72xy^2-27y^3
\n" ); document.write( "5. (2a - 7y)²=
\n" ); document.write( "(2a-7y)(2a-7y) and FOIL
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\n" ); document.write( "square the first, twice the internal product, square the second
\n" ); document.write( "4a^2-2(14ay)+49y^2=
\n" ); document.write( "4a^2-28ay+49y^2 \n" ); document.write( "
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