Quadratic Method

Decide on the best method:
x² - 7x - 18 = 0

• Square Root Method

• Factor Method

• Complete the Square

• Quadratic Formula

Answer explanation

-9 x 2 = -18 and -9 + 2 = -7 so we can definitely factor it and solve it!

Tags

CCSS.HSA-REI.B.4B

Decide on the best method:
x² + 2x = -9

• Square Root Method

• Factor Method

• Quadratic Formula

Answer explanation

When you set it equal to zero you have a c-value of 9 and a b-value of 2. There are no factors of 9 that add to 2 so we need to use the quadratic formula. Let's try it.

Tags

CCSS.HSA-REI.B.4B

Decide on the best method:
x² + 12x - 45 = 0

• Square Root Method

• Factor Method

• Complete the Square

• Quadratic Formula

Tags

CCSS.HSA-REI.B.4B

Decide on the best method:
x(x+5) = 8
hint: simplify first

• Square Root Method

• Factor Method 

• Complete the Square

• Quadratic Formula

Tags

CCSS.HSA-REI.B.4B

Decide on the best method:
x² - 18 = 0

• Square Root Method

• Factor Method 

• Complete the Square

• Quadratic Formula

Tags

CCSS.HSA-REI.B.4B

Decide on the best method:
6x² = 13x - 2

• Square Root Method

• Factor Method

• Complete the Square

• Quadratic Formula

Answer explanation

First set it equal to zero,

then we can try to use tic-tac-toe since a is not 1. It works. If you chose quadratic formula that will work too. See which method is faster for YOU and do that one. Set the time and let's get started.

Tags

CCSS.HSA-REI.B.4B

Determine the values of a, b, and c for the quadratic equation:

4x² – 8x = 3

• a = 4, b = -8, c = 3

• a = 4, b = 8, c = 3

• a = 4, b =-8, c =-3

• a = 4, b = 8, c = -3

The solutions of the quadratic equation

x²-5x+6=0 are

• x=1 or x=-6

• x=-1 or x=6

• x=3 or x=2

• x=-3 or x= 2

Tags

CCSS.HSA-REI.B.4B

To complete the perfect square trinomial in the expression x²-22x+_____, we need to add

• 11

• 121

• 44

• 144

Tags

CCSS.HSA-REI.B.4B

In the expression 4x²-5x+9 the leading coefficient is

• 9

• -5

• -4

• 4