Question

The product of a number and five more than twice a number is 75. Find the number numbers

Answer 1

Assume number =x,

x(2x+5) = 75

=> 2x^2 + 5x -75 = 0

=> 2x^2+ 15x -10x -75 =0

 

=> x(2x+15)-5(2x+15)=0

=>(x-5)(2x+15)=0

x = 5, or x = -15/2