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Mathematics
Kaiya Paul
3 August, 19:10
Factor the expression 6g^2+11g-35
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Sloane Ali
3 August, 21:13
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(3g-5) (2g+7)
Step-by-step explanation:
Compare
6g^2+11g-35 to
ag^2+bg+c.
We should see that a=6, b=11, c=-35.
It these is factoable over the rationals we should be able to find two numbers that multiply to be ac and add up to be b.
ac=6 (-35)
b=11
Now I really don't want to actually find the product of 6 (-35). I'm just going to play with the factors until I see a pair that adds up to 11.
6 (-35)
30 (-7) Moved a factor of 5 around.
10 (-21) Moved a factor of 3 around.
10 and - 21 is almost it. We just need to switch where the negative is because we want a sum of 11 when we add the numbers (not - 11).
So b=-10+21 and ac=-10*21.
We are going to replace b in
6g^2+11g-35
with - 10+21.
We can do this because 11 is - 10+21.
Let's do it.
6g^2 + (-10+21) g-35
6g^2+-10g+21g-35
Now we are going to factor the first two terms together and the second two terms together.
Like so:
(6g^2-10g) + (21g-35)
We are going to factor what we can from each pair.
2g (3g-5) + 7 (3g-5)
There are two terms both of these terms have a common factor of (3g-5) so we can factor it out:
(3g-5) (2g+7)
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