Saturday, April 9, 2011

Top Ten Algebra Mistakes

Check out #1!!!




#10. Squaring the negative. A minus a squared unless it’s been snared: -8^2\neq 64
#09. Logarithms: The log of the sum ain’t the sum of the log: \log(a+b)\neq\log_a+log_b
#08. Shifting function: Add to y go high, add to x go west: y = (x+3)^2
#07. Inequality: Multiplying the inequality by a negative flips the inequality: -3(x<5) \neq -3x<-15
#06. On exponents: When in doubt, write it out: x^4 = x.x.x.x
#05. Fractional exponent: Don’t flip over the root. 25^{\frac{1}{2}} \neq \frac{1}{25^2}
#04. Subtraction: Don’t forget to share the minus and the negativity. x-(3+x) \neq x-3+x
#03. Cancellation: Cancel factors, not individual terms. \frac {x}{x-5} \neq \frac{1}{-5}
#02. Quadratics: Remember exponents 2, answers 2. x^2=25, x=5, x=-5
#01. Squaring: Don’t forget to FOIL. (x-3)^2 \neq x^2 -9.

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