416 prompts matching "Squaring both sides safely when solving a surd equation"
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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WAEC Prep: Setting out Cramer's rule for three simultaneous equations
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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WAEC Prep: Simultaneous equations with fractional coefficients solved by matrix
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WAEC Prep: Writing two simultaneous equations as a single matrix equation
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Practice: What a singular coefficient matrix says about the equations
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WAEC Prep: When the matrix method is worth the work for three unknowns
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WAEC Prep: Writing three simultaneous equations as a single matrix equation
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Practice: Comparing the inverse method with elimination for three equations
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Worked Example: Checking the solution of three equations by substitution
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WAEC Prep: Resolving before compounding several forces
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WAEC Prep: Why one component vanishes when the direction is chosen well
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WAEC Prep: Resolving a force into horizontal and vertical components
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Learn: A space diagram and a force diagram drawn side by side
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Learn: The algebraic sum of moments when the senses differ
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Practice: Resolving three forces in two perpendicular directions
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Spot My Mistake: When Lami's theorem may be used, and when it may not
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Practice: Using the normal tables when the z-score is negative
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WAEC Prep: When a Poisson distribution approximates a binomial one
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Spot My Mistake: When the normal distribution may approximate the binomial
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