exam Maths Puzzle Numerical Ability

Find the axis of symmetry.
y = x^2 + 7x + 4

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exam Other Question

Divide. Simplify if possible

(21x^2-20xy+4y^2/28^2+27xy-10y^2) divided by (15x^2-19xy+6y^2/10x^2+9xy-9y^2) Express in simplest form: 5x-3(x-2)+1