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Mathematics
Ireland Salazar
11 July, 12:32
Solve (-2x-1) (9x+2)
Solve and show work
+5
Answers (
1
)
Lillie Snow
11 July, 14:02
0
-0.5 or - 2/9
Step-by-step explanation:
(-2x-1) (9x+2)
open the bracket
-18x² - 4x - 9x - 2
-18x²-13x-2
(18x²+9x) (+4x+2)
factorise
9x (2x+1) + 2 (2x+1)
(9x+2) (2x+1)
:separate the bracket and equate to 0
9x+2=0
collect like terms
9x = - 2
divide through by 9
x = - 2/9
or
4x = - 2
divide through by 4
x = - 2/4
: x = - 0.5
answer = - 0.5 or - 2/9
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