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- 6x + 1
2. -x² + 6xy + 3y² - 5x² -9xy - 4y²
- 3xy -
3. (a) - 15y)
(b) + 10x - 2x - 10 = + 8x - 10
= 6x`2 -12x +15 + 8x`2 +6x -14 = 6x`2 +8x`2 -12x`+6x+15-14
= 14x`2-6x+1
2) (5x`2-9xy-4y`2) - (-x`2 +6xy + 3y`2)
5x`2 -9xy -4y`2 +x`2 -6xy-3y`2 = 5x`2 + x`2 - 9xy -6xy -4y`2-3y`2
= 6x`2-14xy-7y`2 = 6x`2 -7y`2 -14xy
3) a. 20x`3 -15x`2y
b. 2x`2 +10x-2x-10 = 2x`2+8x-10
c, x`3 -4x`2 +20x -5x`2+20x-100 = x`3 -4x`2 -5x`2 +20x +20x -100
= x`3 -9x`2 +40x -100