A1 M8 Review warm up

Using the graph solve the equation
-x²-2x+3=-5.

• {-3,-1}
• {-2,0}
• {-4,2}
• {-1,4}

Solve by taking square roots:

5b² - 4 = 41

• b = 9, b = -9

• b = 3, b = -3

• b = 8, b = -8

• no real solution

Solve for x:

(x + 6)² = 49

• x=7,12

• x=±7

• x=1,-13

• x=43,-55

What should you do first to solve this equation using quadratic formula?

x² + 6x - 13 = 3

• Get factored form

• Write down: a=1, b=6, c=-13

• Make it equal 0 by subtracting 3 on each side

• Type it all in a calculator.

When solving a quadratic equation, 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

Alanna says that the equation y = 2x² - 3x - 2 has two real solutions. Is she correct?

• No because the discriminant is negative

• Yes because the discriminant is positive

• Yes because the discriminant is zero

• No because the discriminant is zero

Use the quadratic formula to solve 2x² + 2x - 12.

• -2, 3

• 2, 3

• 2, -3

• -2, -3

Solve

(n +7)(n + 9) = 0

• n = -7; n = 4

• n = 7; n = -9

• n = -3; n = 10

• n = -7; n = -9

Use the discriminant to find the number of solutions for the following equation.

y = -3x² +5x - 8

• 2 solutions

• 1 solution

• 0 solutions

Identify the solutions of the graph?

• x= 0 and x= -4

• x= 0 and x= 4

• y= 0

• x= 2