exam Maths Puzzle Numerical Ability

THis is a factoring word problem using the principle of zero. The question says "Find two consecutive, negative integers whose product is 156." Could you please help me?

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exam Other Question

AC and BD are perpendicular to AB. CD intersects AB at N. AB = 30 and AC = 8. If AN = x and BD = y, express y in terms of x.

I am confused how to draw this. Can someone show me how to do this problem?

Factor completely 9x^2-4