exam Maths Puzzle Numerical Ability

did i factor this right?
5x^2-4xy+5x-4y

5x^2-4xy+5x-4y
(5x^2*4xy+5x)-4y
5x^2+4xy+5x=(1+2x)(1+5x)
=(x+2x)^2

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exam Other Question

-8x-12< or equal to -2(3x+5) solve the inequality express your answer in interval notation HELP! I need assistance with this demand supply problem!
The demand and supply equations for a certain item are given by
D=-5p+40
S=-p^2+30p-8
Find the equilibrium price!
Thanks in advance!
ac