exam Maths Puzzle Numerical Ability

Factor to make 2 binomials
2x^2 + 5xy - 2y^2

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exam Other Question

The supplementary angle is 15 degrees less than 4 times the complementary angle. Find the angle.

In the office, we have come up with two different solutions: 55 degrees and 39 degrees.

Which one is right?
solve the equation show all work
x^2 - 3x = 10
x^2 - 3x + 10 = 0
x(x-3 + 10) = 0
I have no idea how to finish this problem