book Maths Puzzle Numerical Ability

Solve equation below using the quadratic formula.
1. x2+4x+3=0

Im hoping you can help me and you know the fomula

Thank You,

Sarah

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book Other Question
prove by mathematical induction that x-y is a factor of x^n- y^n factor by grouping with complete solution
1. x² - y² - x -y
2. x³ - y³ - x² + 2xy - y²
3. x² + xy - 2y² - x³ + y³