Solving Quadratics with Formula

Use the quadratic formula to find the solutions for

-x² +7x - 18 = 0

• -4.9 and -0.1

• {-10, 10}

• no solution

What is this formula?

• This is the speed of light formula.

• This is the quadratic formula.

• This is the zero product property.

• This is scary.

When using the Quadratic Formula method, what are a, b, and c for the equation: 9x²-x+5=0?

• a=9, b = -1, c =7

• a=1, b = 0, c =7

• a=9, b = -1, c =5

• a=9, b = 7, c =2

Identify the 'c' value: y = 16x² -8x -24

• 16

• -8

• 24

• -24

Use the quadratic formula to find the solutions for -x² + 9x -100 = 0

• -9 and 0

• no solution

• 0 and 9

• 9 and 18

When do you use the plus or minus symbol?
±

• After taking the square root of both sides

• After adding the square to both sides

• After taking half of b

• After setting the equation equal to zero

Find the value of "c" that completes the square. Hint: Use the formula below

• -4

• 4

• 8

• 16

Find the value of "c" that completes the square. Hint: Use the formula below

What do you do to the b value to correctly complete the square?

• square it

• divide it by 2 and square the result

• divide it by 2 and take the square root of the result

• divide it by 2 only