Solving Quadratic Equations by formula

Solving Quadratic Equations by formula

Cahlan

&

Ja’nae

Explanation

• You can solve the standard form of the quadratic equation for x. 02 cbxax

Detailed Steps

• Step 1:a=1 b=-2 c=-24• Step 2:• Step 3:• Step 4:• Step 5:• Step 6:• Step 7:

a

acbbx

2

42

12

241422 2

2

9642

2

102

2

1002 or

2

102 x or

2

102x

4 6

02421 2 xx

click for next slide

Here’s some problems for you to try.

1.

2. 3. 4. 5. 6. 7. 8. 9.

0672 xx

045 2 yy

502 2 zzss 401004 2 02073 2 tt

0252 r025.6104 2 pp

0372 2 nn

025204 2 nn

015112 2 xx

.10

click for next slide

Now check your answers

click for next slide

10 problems with correct solutions

• Problem 1:

1261477 2

2

24497

2

257 12

57

62

57

6,1: solutions

0672 xx

click for next slide

Continuation

• Problem 2: 045 2 yy

5245411 2

10

8011

10

811

110

91

8.10

91

8.,1: solution

click for next slide

Continuation

• Problem 2: +50 +50502 2 zz

0502 2 zz

4

40011

4

3991

nosolution

22

502411 2

click for next slide

Continuation

• Problem 4: -40s -40s ss 401004 2

0100404 2 ss

42100444040 2

8

1600160040

8

040

8

040

8

040

5:solution

ss 401004 2

click for next slide

Continuation

• Problem 5 : 02073 2 tt

32

203477 2 t

6

240497

6

2897

46

177

2

6

177

2,4: solution

click for next slide

Continuation

• Problem 6: 0252 r

120142525 2

2

062525 2

62525

2

25252

2525

25,0: solution

click for next slide

Continuation

• Problem 7: 025.6104 2 pp

42

25.6441010 2

8

10010010

8

010

18

010

18

010

1:solution

click for next slide

Continuation

• Problem 8: 0372 2 nn

22

32477 2

4

24497

4

737

4

5.874

5.87

375.0,875.3: solution

click for next slide

Continuation

• Problem 9: 015112 2 xx

22

15241111 2

4

12012111

4

111

4

1114

111

3:solution

click for next slide

Final Continuation

• Problem 10: 025204 2 nn

42

23442020 2

8

40040020

8

020

8

0208

020

5.2:solution

Summary Tool

• Plug in “A” value with “A”• Plug in “B” value with “B”• Plug in “C” value with “C” THEN SOLVE

aacbb

2

42

Websites

• http://www.mathskills.com/• Pentominoes – Use the 12 pentomino

combinations to solve problems (www.usu.edu.GAME)

• www.algebra1.com (online practice testing)