book Maths Puzzle Numerical Ability

expand the brackets in the following

x(3-y)
(x+1)(x+2)
az(z2+bz)
(x+y)(x-y)

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book Other Question

Please help me with these problem..
solve by any method.
1)x^2+25=10x
2)10h-2=11h^2 Curt Harris received a raise.He now makes $150 less than twice his old salary.Write an expression for Mr. Harris's current salary if his old salary was s.