exam Maths Puzzle Numerical Ability

please help me solve

factor the trinomial

-6m^2-13m+15

i keep getting
(m+3)(-6m+5) the answer says -(6m-5)(m+3)

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exam Other Question

If the perimeter of a rectangle is 24 ft and the width is 7 ft, find its length. [Hint: The perimeter of a rectangle is given by P = 2L + 2W.] How do I solve this: 1/4S=1/4+1/10+1/20