exam Maths Puzzle Numerical Ability

1. find the product
(2x+5y)^4

I know that it is
1 4 6 4 1

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exam Other Question

Find the x-intercepts. Express your answer as an ordered pair. y = x^2 - 7x - 10 The equation x^3 = 9 + 46i where i = sqre root of -1 has a solution of the form a + bi where a and ba are integers. Find a + b.

I have this problem down to the system: a^3 - 3ab