Expanding multiplies out brackets: every term in one factor times every term in the other, then like terms combined. (x + 1)³ expands to x³ + 3x² + 3x + 1. The coefficients are a row of Pascal's triangle.
Eksempel på arbeid · expand (x+1)^3
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Symboler som brukes her
Trykk på et symbol for den fulle definisjonen, et bilde og hva hver bokstav i det betyr.
Hvordan: Expanding
- Start from the expression.
- Distribute (multiply out) the products.
Spørsmål folk stiller
What does it mean to solve an equation?
To find every value of the unknown that makes both sides equal. Each step is an operation applied to both sides that keeps the solution set the same, until the unknown stands alone.
Why do I sometimes get two answers?
A quadratic can cross the axis twice, so it can have two solutions. A degree-n polynomial has up to n. The graph shows where each one comes from.
How do I know whether to factor or use the quadratic formula?
Try factoring for a few seconds: look for two numbers that multiply to a·c and add to b. If nothing obvious appears, the discriminant b² − 4ac tells you how many real roots there are, and the formula finds them without guessing.
Mer i Algebra
Linear equationsQuadratic equationsSystems of equationsInequalitiesFactoringSimplifying expressionsFunctions and graphsExponential and logarithmic equationsPolynomial equationsAbsolute value