Exam Maths Puzzle Algebra

Solve for X,Y,and Z in the following systems of threme equations:

A) X+2Y+Z =6
X+Y=4
3X+Y+Z=8

B) 10X+Y+Z=12
8X+2Y+Z=11
20X-10Y-2Z=8

C) 22X+5Y+7Z=12
10X+3Y+2Z=5
9X+2Y+12Z=14

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Exam Other Question

1. What is f(3) if f(x)=-5x^3+6x^2-x-4 ?

2. What is f(x+1) if f(x)=6x^3-3x^2+4x-9 ?

3. What is 3[f(x+2)] if f(x)=x^3+2x^2-4 ?

4. Use synthetic division to determine which How do you solve polynomial equations such as:

(x-3)(x-squaured+3x-4)=0

(x+2)(x-squared+5x+1)=0