1,324 prompts matching "Complete the square for x^2 - 10x + 21 = 0"
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WAEC Prep: Comparing the sizes of two surds without a calculator
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Common Mistakes: Solving an equation in which the unknown sits under a root
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Show All Working: Solving a logarithmic equation and rejecting the invalid root
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Worked Example: The discriminant, and what each of its three cases means
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Show All Working: Finding a coefficient given a stated relation between the roots
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Common Mistakes: Symmetric functions when the three roots of a cubic are involved
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Explain Back: Finding an unknown coefficient given that a stated factor divides the polynomial
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Worked Example: The sum of the products of the roots of a cubic taken two at a time
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Worked Example: Solving a quadratic inequality by sketching the parabola
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Worked Example: The number of arrangements of n different objects in a row
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Explain Back: Arrangements in which two particular objects must stay together
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Show All Working: Arrangements of the letters of a given word
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Common Mistakes: Arrangements restricted at the first or the last place
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Worked Example: The difference between a permutation and a combination
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WAEC Prep: Pascal's triangle and the combination numbers in it
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Show All Working: Counting the handshakes, or the lines joining n points
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Show All Working: Solving a cos x plus b sin x equals c by the R method
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Common Mistakes: Giving the general solution of a trigonometric equation
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Worked Example: The shape, period and range of the cosine curve
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Explain Back: The effect of b in y equals sin bx on the period
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