Solving Quadratic Equations Quadratic Formula

The solutions of the quadratic equation 
x²+2x-15=0 are

• x = 3 or x = 5
• x = 5 or x = -3
• x = -5 or x = 3
• x = -3 or x = -5

The solutions of the quadratic equation 
x²+12x+35=0 are

• x = -5 or x = -7
• x = 5 or x = 7
• x = -35 or x = -1
• x = -9 or x = -4

What are the solutions to this equation?
(3x-2)(5x+1)=0

• x=5/2,-1/3
• x=1/5,-2/3
• x=1/3,-5/2
• x=2/3,-1/5

Solve for x.  Round to the nearest hundredth if necessary.
x² + 18 = 9x

• x = 3, 6
• x = -3, -6
• x = -3, 6
• x = -6, 3

Solve for x.  Round to the nearest hundredth if necessary.
x² - 10x = -25

• x = 5
• x = -5
• x = -5, 5
• x = 25

Solve for x.  Round to the nearest hundredth if necessary.
x² + 11x + 5 = -5

• x = -1, -10
• x = 1, 10
• x = 0, 11
• x = 0, -11

Solve using the quadratic formula.
2x² - 9x - 35 = 0

• x = 7/2, x = -6
• x = -5/2, x =5
• x = -3/7, x =6
• x = -5/2, x = 7

Solve the equation: 
5x² - 35x + 60 = 0

• x = 3,  -4
• x = -3,  4
• x = 3,  4
• x = -3,  -4

What should you do first in solving this equation?
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.