669 prompts matching "IGCSE practice: A two-set survey problem solved with a Venn diagram"
WAEC pitfalls: Assuming matrix multiplication is commutative
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Teach me: The determinant of a 2 by 2 matrix
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Quiz me: Calculating a determinant from the four entries
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Spot my mistake: Forgetting to swap the leading diagonal when inverting
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Worked example: Verifying an inverse by multiplying back to the identity
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WAEC pitfalls: Dividing by a determinant of zero
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Teach me: Writing a pair of simultaneous equations in matrix form
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Quiz me: Identifying the coefficient matrix and the constant matrix
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Spot my mistake: Multiplying by the inverse on the wrong side
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Worked example: Solving a 2 by 2 system by the matrix method
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WAEC pitfalls: Writing the coefficients out of order in the matrix
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Teach me: The shape of a quadratic graph, and what the sign of a does to it
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Quiz me: Making a table of values for a quadratic
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Spot my mistake: Plotting a point from the wrong row of the table
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Worked example: Sketching a quadratic from its factorised form
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Quiz me: Reading a solution off a graph to a stated accuracy
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Spot my mistake: Reading the intersection off the wrong axis
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Worked example: Solving a quadratic graphically by adding a straight line
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WAEC pitfalls: Giving a graphical answer to more accuracy than the scale allows
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Spot my mistake: Shading the wrong side of a boundary line
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