book Maths Puzzle Numerical Ability

Olie is told that the installation of insulation in the attic and walls of his home will decrease his heating costs be 15 percent. How long will be required for the installation to

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please help me im doing my homework can you help me on this.

(-2n)(-n^2) 3 and -1....write that into a quadratic equation that correspnds to each pair of roots?(assume there is no vertical shrink or stretch) then write the equation in factored form and