book Maths Puzzle Numerical Ability

please help me with this problem thank you

a^2-6ab+8b^2

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book Other Question

x= 2y-1 and 2x+y=81

solve using substitution

x=?
y=?

show work please thank you!!
Find the GCF of each product (6y^2 - 3y) (y + 7)