-b formula

johannab311
Note by , created about 6 years ago

junior cert Maths Note on -b formula, created by johannab311 on 10/01/2013.

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johannab311
Created by johannab311 about 6 years ago
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Page 1

-b formula

ax   + bx + c = 0

2

to find the value of x

e.g;   3x   + 11x + 6 = 0

2

      -b - \

+

I

__________

___________________

X =

b  - 4ac

2

2a

X =

-11 -

___________________

+

\

I

__________

(11)

2

-

4(3)(6)

2(3)

1).

2).

3).

121-72

X =

-11 - \

+

________

I

_____________

6

-11 -  \  49

_____

I

____________

+

X =

6

4).

X=

-11 - 7

__________       6

+

X= -3

X= -0.6

.

-b