Question

Add
$1: 3x + 2y + 4z + - 5x + 3y + 7z + - 3x + 4y - 8z \\2: 7 {x}^{2} + 4x + 3 + - 5 {x}^{2} - 4x - 3 + - 6 {x}^{2} - 3x - 7 \\ 3: -9 {x}^{4 } + 7 {x}^{3} + 6 {x}^{2} + 3x + 2 + - 8 {x}^{4} + 2 {x}^{3} - 4 {x}^{2} + 3x - 3 + - 7 {x}^{4} + 6 {x}^{3} + 2 {x}^{2} + 4x + 5$

Answer 1

1. {3+(-5)+(-3)}x + {2+3+4}y + {4+7-8}z

= -5x+9y+3z

2. {7+(-5)+(-6)}x² + {4-4-3)x + {3-3-7}

= {-4x²}+{-3x}+{-7}

3. {(-9)+(-8)+(-7)}x⁴ + {7+6+2}x³ + {6+(-4)+2}x² + {3+3+4}x + {2-3+5}

= {-24x⁴} + 15x³ + 4x² + 10x + 4

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