A mathematical statement on behalf of the equality of two terms is known as an equation. There will be always an equal to sign in between the expressions.

An algebraic equation of degree one is known as linear equation. An equation of degree two is known as quadratic equation. Examples: $x + 5$ = $9$ is a linear equation while $x^2 + 4x + 4$ = $0$ is a quadratic equation.

The value of $x$ for which the equation gets satisfied is known as the solution to the equations.

In algebra, we can explain if we change the order that will not change their sum.

• If we add zero to any number the answer will be the number itself. For example $x + 0$ = $x$

• If two sides of an equation are equal we can add or subtract the same number to both sides.

• **Order of operations** to be explain: Operations inside the parenthesis or bracket of algebra equations are done first. Next we do operations involving exponents. Multiplication and division from left to right are done next. The addition and subtraction from left to right are done as a final operation. In short PEMDAS.

• **Multiplication** is written in three different ways. For example $5$ multiplied by $x$ can be written as $5 \times x$ or $5x$ or $5(x)$.

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Solve $2x + 3x$

$2x + 3x$ = $(2 + 3)\ x$

= $5x$

Multiply $3ab$ and $4b$

$(3 ab) \times (4b)$ = $(3ab) \times (4b)$

= $3ab^2 \times 4$

= $3 \times (4ab^2)$

= $12 \times ab^2$

= $12ab^2$