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# Theory U.3

### Unit 3: Equations, inequations and systems.

Term | Definition |
---|---|

Biquadratic equation | Biquadratic equations are fourth-degree equations with no odd-degree terms. ax4 + bx2 + c = 0 |

Rational equation | An equation contains at least one algebraic fraction. |

Equations with radicals | Equations where x is under a square root. |

Exponential equations | Exponential equations are equations where the unknown is in the exponent. |

Logarithmic equations | Logarithmic equations are equations where the unknown is in an expression affected by a logarithm. We solve them by looking at the properties of the logarithms. |

System of linear equations | Two equations form a system of equations when our aim is to find a common solution. If both equations are linear, it is called a linear system. ax + by = c a'x + b'y = c' |