Intro to Exponents Learn to evaluate expressions with exponents.

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Presentation transcript:

Intro to Exponents Learn to evaluate expressions with exponents.

Review Find the product (–7) (–7) (–7) –343 81

The term 2 7 is called a power. If a number is in exponential form, the exponent represents how many times the base is to be used as a factor. 7 Exponent Base 2

Identify how many times 4 is a factor = 4 4 Write in exponential form. A Identify how many times d is a factor. d d d d d = d 5 B. d d d d d Read 4 4 as “4 to the 4 th power.” Reading Math

Identify how many times –6 is a factor. (–6) (–6) (–6) = (–6) 3 Identify how many times 5 is a factor. 5 5 = 5 2 C. (–6) (–6) (–6) D. 5 5 Write in exponential form. Remember to keep the – sign inside the ( )! If it is outside, your answer will be negative even if you have an even number of – signs.

Identify how many times x is a factor. x x x x x = x 5 Write in exponential form. A. x x x x x Identify how many times d is a factor. d d d = d 3 B. d d d

A. 3 5 = = Find the product of five 3’s. = –243 = (–3) (–3) (–3) (–3) (–3)(–3) 5 Find the product of five –3’s. B. (–3) 5 Always use parentheses to raise a negative number to a power. Helpful Hint Evaluate.

C. 7 4 = = Find the product of four 7’s. = –729 = (–9) (–9) (–9)(–9) 3 Find the product of three –9’s. D. (–9) 3 Evaluate.

Simplifying Expressions Containing Powers = 47 Simplify (2 5 – 3 2 ) + 6(4) = (32 – 9) + 6(4) = (23) + 6(4) = Evaluate the exponents. Subtract inside the parentheses. Multiply from left to right. Add from left to right.

= –49 Simplify (3 2 – 8 2 ) = (9 – 64) = (–55) = – Evaluate the exponents. Subtract inside the parentheses. Multiply from left to right. Add from left to right.