exam Maths Puzzle Numerical Ability

please can you show me a method of how to work out this equation x^2+9x+14=0

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exam Other Question

WRITE A NUMERICAL EQUATION THAT REPRESENTS EACH STATEMENT

WHEN A NUMBER IS A IS DOUBLED, THE RESULT IS TWELVE Please help me with this problem: A five-pointed star is inscribed in an irrergular pentagon, how do I find the formula for the sum of it's angles? I tried drawing it in the regula