GRE Math

When do you change the inequality sign?

when multiplying or dividing by a negative number

what are the three common quadratics formation?

1. x²- y²= (x+y)(x-y)

2. (x+y)²=x²+2xy+ y²

3. (x-y)²=x²- 2xy+ y²

what do you to exponents with same base when multiplying them?

multiplying= adding the exponents together

what do you to exponents with same base when dividing them?

dividing= subtracting the exponents

what do you to exponents with same base when raising them to another power?

power= multiply the exponents

Negative exponents work how?

they become positive reciprocals (ie -2 becomes 1/2)

what happens to fractions when raised to a power?

they get smaller

adding or subtracting square roots

can only add or subtract when root values are equal

multiplying or dividing square roots

no restrictions on the multiplication or division (divisions cna be re-written)

what is an integer

any number that have no fraction or decimal

zero- odd or even?

even

are non-integers odd or even

neither

even+even=

even

even+odd+

odd