Example

Title: Simplify the expression

Grade: 9-a Lesson: S1-L1

Explanation: The best way to understand algebra is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

1. Simplify \$(4x^3)(3y^2)(2x^2y^(-2))\$.

Step 1a

Rewrite the expression.

Explanation: Rewrite the expression,

\$(4x^3)(3y^2)(2x^2y^(-2))\$ as

\$(4x^3)(3y^2)(2x^2)/y^2\$.

Step 1b

Evaluate the exponents.

Explanation: Evaluate the exponents by using law of exponents

  1. \$a^m times a^n = a^(m + n)\$ &

  2. \$a^m div a^n = a^(m - n)\$.

\$ 4(x^3)2(x^2)((3y^2)/y^2)\$

⇒ \$4(2)(x^(3 + 2))(3y^(2-2))\$

⇒ \$4(2)(x^(5))(3y^(0))\$

⇒ \$4(2)(x^(5))(3(1))\$ ∵ \$a^0 = 1\$

Step 1c

Perform multiplication among the terms.

Explanation: Operate multiplication among the terms in the expression obtained afer evaluating the exponents.

⇒ \$4(2)(x^(5))(3(1))\$

⇒ \$8(x^(5))3\$

⇒ \$24(x^5)\$

⇒ \$24x^5\$

\$(4x^3)(3y^2)(2x^2y^(-2)) = 24x^5\$.


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