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# 7th grade Polo Park

### To study 7th grade avanced math, especially for Mr. Ring's class, at polo park.

TermMeaningNumerical exampleAlgebraic exampleExplanation
Distributive Property To distribute a number through parenthesis by multiplying it. 6(3 + 9) = 18 + 54 8(x+7) = 8x + 56; 5x(7 + 9y) = 35x + 45xy The parenthesis are to do first, but they also mean to multiply. If you multiply a number to each term inside, you get distributive property.
Multiplication by -1 (sometimes shown as -) (a property of multiplication). To invert the sign of a number. (7 ) (-1) = -7; -(-9) = 9 -(y) = -y; -(-x) = x Because the negative sign means to invert the sign, the multiply. Anything time 1 is equal to 1, so just invert the sign when multiplying -1.
Number sets A set of numbers Natural numbers = {1, 2, 3 ...} x = {-3, -1, 0, 4, 6, 9, } Number set explanation pending.
Roots Inverse of exponents, repeated division. √9 = ±3 √(x^2) = x Roots explanation pending.
Scientific Notation A notation used by scientists for very big and very small numbers. 8,920,000 = 8.92 * 10 ^ 6 3,000,000x = 3x * 10 ^6 Scientific Notation explanation pending.
Power To multiply something by itself, in a computer represented usually by ^, but in paper written above & smaller than the base. 6(6) = 6^2 x(x) = x^2 Power explanation pending.
Created by: Nitrogen7