book Maths Puzzle Numerical Ability

(5m+5)=7-2m I NEED HELP!!!!!
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I need to know how the signs of A and C (in the quadratic equation: Ax^2+bx+c=0) provide clues as to the number of possible solutions in a quadratic equation.

Thanks in advance! express as a single logarithm: ln7 + 1/2 ln9