exam Maths Puzzle Numerical Ability

8b(b + 2b^3c + b^4) + 4b^2(1 + 6b^2c + b^3)

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exam Other Question

The parabola y=x2-4 intersects the x axis at two points, P and Q. What is the distance from P to Q? give an equation for the line whose x-intercept is 5 and whose y-intercept is -4