Question

6.Factorise the following expressions completely.
pls check whether my answer is right. @ganeshie8

Answer 1

a)=-8c^2+39c+5
=8c^2-39c-5
=(c-5)(8c+1)

Answer 2

but the answer in my book said it's (c-5)(-8c-1)

Answer 3

-8c^2+39c+5

(40)(-1) = -40
40 - 1 = 39

so you can split the middle term as 40 - 1

Answer 4

-8c^2+ `39c` +5

-8c^2+ `40c - 1c` +5

Answer 5

factor the GCF from first two terms and last two terms

Answer 6

-8c^2+ `39c` +5

-8c^2+ `40c - 1c` +5

-8c(c - 5) - 1(c - 5)

Answer 7

=(c-5)(-8c-1)

Answer 8

Yes!

Answer 9

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