exam Maths Puzzle Numerical Ability

What would the graph of the quadratic function {y=ax(7+3x),a is less than 0} look like?

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exam Other Question

solve the system using the linear combination method: 5x+y=6 -5x+3y=-22 Please help this is confusing to me.
Factor each polynomial by grouping the first two terms and the last two terms.
x^3 - 4x^2 + 2x -8