exam Maths Puzzle Numerical Ability

Factor completely: 2x^2 + 4x - 6

I got:
cannot be facored?

Thanks~

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exam Other Question

Find the area of the rectangle
top side of the rectangle is sqrt (3) + sqrt (5)
side of the rectangle is sqrt (3) + sqrt (5) 2x-4y=8 please help solve this, I need to graph each linear equation by finding the x & y intercepts