Answers

2016-07-04T21:26:54+08:00
4x^2 +9y^2 +16z^2 +9w^2 +25u^2

Note: Squaring negative numbers will be a positive number.

Square or other exponents when multiplied simply add the exponents.
1 5 1
2016-07-09T21:05:17+08:00
4x^2+12xy+9y^2-16xz-24yz+16z^2+12wx+18wy-24wz+9w^2-20ux-30uy+40uz-30uw+25u^2
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