You will apply them when solving quadratic equations in which the quadratic expression cannot be factorised.
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Surds are normally irrational numbers.
Roots that are irrational are called surds. There are irrational numbers that are not surds since they are not roots of any equation. For example, Pi. Rational roots, such as square root of 4, are not surds.
Irrational number are NOT called surds. For example, pi is irrational but it is not a surd.Surds are a very small subset of irrational numbers.
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u cant... next question like a boss. You can use them for engeneering and banking.