# MTEL Middle School Mathematics Science 51 Teacher by Sharon Wynne By Sharon Wynne

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Additional resources for MTEL Middle School Mathematics Science 51 Teacher Certification, 2nd Edition (XAM MTEL)

Example text

Check: x 2 + 10 x − 24 = 0 ( −12)2 + 10( −12)= − 24 0 (2)2 + 10(2)= − 24 0 144 −= 120 − 24 0 4= + 20 − 24 0 0 0= 0 0 = A quadratic equation that cannot be solved by factoring can be solved by completing the square. Example: Solve the equation. x2 − 6x + 8 = 0 − x2 − 6x = 8 Move the constant to the right side. x2 − 6x + 9 = − 8 + 9 Add the square of half the cooeffient of x to both sides. ( x − 3)2 = 1 Write the left side as a perfect square. x − 3 =± 1 Take the square root of both sides. x= −3 1 x= − 3 −1 x 4= x 2 = MATHEMATICS/SCIENCE MS Solve.

To find the slope of a line, solve the equation for y. This gets the equation into slope intercept form,= y mx + b . m is the line's slope. - To find the y intercept, substitute 0 for x and solve for y. This is the y intercept. The y intercept is also the value of b in= y mx + b . - To find the x intercept, substitute 0 for y and solve for x . This is the x intercept. - If the equation solves to x = any number, then the graph is a vertical line. It only has an x intercept. Its slope is undefined.

9) Since the time has to be positive, it will be about 980 seconds until the rocket is at sea level. MATHEMATICS/SCIENCE MS 51 TEACHER CERTIFICATION STUDY GUIDE To graph an inequality, graph the quadratic as if it was an equation; however, if the inequality has just a > or < sign, then make the curve itself dotted. Shade above the curve for > or ≥ . Shade below the curve for < or ≤ . Examples: 10 8 6 4 2 0 -10 -8 -6 -4 -2 0 2 4 6 8 10 -2 -4 -6 -8 -10 10 8 6 4 2 0 -10 -8 -6 -4 -2 -2 0 2 4 6 -4 -6 -8 -10 -12 MATHEMATICS/SCIENCE MS 52 8 10 TEACHER CERTIFICATION STUDY GUIDE 0010 Understand properties and applications of exponential, polynomial, rational, and absolute value functions and relations.