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Chapter 9

Chapter 9. Entry Task, write this down . If b 2 =a then b is the square root of a. All positive real numbers have two square roots: a positive square root and a negative square root. Square roots are written with a radical symbol√, the number inside the symbol is the radicand.

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Chapter 9

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  1. Chapter 9

  2. Entry Task, write this down • If b2=a then b is the square root of a. • All positive real numbers have two square roots: a positive square root and a negative square root. • Square roots are written with a radical symbol√, the number inside the symbol is the radicand. • Numbers whose square roots are whole numbers are called perfect squares. • The square roots of numbers that are not perfect squares are part of the set of irrational numbers. • A radical expression involves square roots (or radicals). • A quadratic equation is an equation where the highest power of the variable is 2. • The standard form of a quadratic equation is ax2 + bx + c=0.

  3. Entry Task: copy this downThe quadratic Formula • A quadratic equation of the form ax2 + bx + c=0 can be solved using the quadratic formula. • This formula can also be used to find where the function f(x)=ax2 + bx + c crosses the x axis

  4. Quadratic Functions • F(x) = ax2 + bx + c

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