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3 years ago

Solve (-2x-1)(9x+2) Solve and show work

Mathematics

1 answer:

tresset_1 [31]3 years ago

3 0

Answer:

-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

4x = -2

divide through by 4

x = -2/4

: x = -0.5

answer = -0.5 or -2/9

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