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Can anyone show me the way to solve this following equation by factorising, i need to see all workin out so i can fully understand, i've been pulling my hair out all day today. hope someone can help me.
2xsquared -5x - 7 = 0
i think u have learnt how to factorise quadratics the same way i have.
a= 2 b=-5 c=-7
a times c 2 times -7 is -14
so now u have to list all the factors of -14 until u find a pair that adds up to b which is -5.
2 plus -7 equals -5
so.... now u do the rest
can u remember it now? if u dont understand this way then i cant help u coz i have only learnt it like this, its possible maybe some1 else can help u tomorow
2 and -7 add up to -5 so u put the pair into brackets such as
(2x - 7)(x + 2) = 0
then u expand the brackets
as in 2xsquared+2x-7x-14
then u simplify the equation into
2xsquared-12x-7(check this bit im not entirely sure about this)
hope it helps...............
The start: SOLVE
Where you are now: You've factorised and got .
(Note the typo in post #7)
The finish: You have to SOLVE .
In case you missed it, the key word in finishing the question is SOLVE:
So the SOLUTION to is .
Now there's no more work required.