A surd is an irrational number expressed as the root of a rational number.

Solving equations with surds

Maths

In the prior unit, pupils explored the concept of square root, including calculating this on their calculators. In this unit, pupils work with surds and the notion that a surd is both an operation and the result of that operation.

Surds

Solve $$x\sqrt {180} - 30 = x\sqrt {80}$$ and write your answer in the form $$a\sqrt {b}$$. State the value of $$b$$.

Solve $$x\sqrt {180} - 30 = x\sqrt {80}$$ and write your answer in the form $$a\sqrt {b}$$. State the value of $$a$$.

True or false? The solutions to $$2x^{2} + 9x - 2 = 0$$ are $$x = -9 \pm \sqrt {97}$$

True or false? The solutions to $$x^{2} + 5x - 4 = 0$$ are $$x = \frac{1}{2} (-5 \pm \sqrt {41})$$

Is this statement true or false? "There are always two solutions to a quadratic equation"

Solve the equation $$2(3x - 10) - 3(7 - 5x) = 484$$

$$x^{2} + 2bx + c = (x + b)^{2} - b^{2} + c$$ is known as completing the {{}} .

Select the correct form for the quadratic formula.

Simplify the expression: $$\sqrt {12} \times \sqrt {30}$$

This lesson will soon be taken down.

Solving equations with surds

Lesson outcome