Solve Quadratics

Solve by taking square roots:

5b² - 4 = 41

• b = 9, b = -9

• b = 3, b = -3

• b = 8, b = -8

• no real solution

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

which of the following show the quadratic formula being used properly?

Which equation matches these solutions? x=5,-7

• (x+5)(x-7)=0
• (x-5)(x+7)=0
• (x+5)(x+7)=0
• (x-5)(x-7)=0

Find the zeros of this quadratic.

• b=4/5, b=3
• b=4, b=-3
• b=1/5, b=3
• b=4/5, b=-3

If the discriminant is zero, you will have ...

• no real solutions

• 2 real solutions

• 1 real solution

• 3 real solutions

To solve a quadratic by graphing is to find where the parabola crosses the x-axis. We call these the ___. Select all that apply.

• zeros

• x-intercepts

• solutions

• roots

• y-intercept

Factor completely:

16m² - 25

Which is a factor?

• (4m - 25)

• (4m + 5)

• (8m + 5)

• (8m + 25)