Question

(2x+3)^2-x^2=144. What is the value of x?

Answer 1

Answer:

5,-9

Step-by-step explanation:

∴$(2x+3)^2 -x^{2} =144\\4x^{2} +9+12x-x^{2} =144\\3x^{2}+12x=135\\x^{2} +4x-45=0\\x(x+9)-5(x+9)=0\\\\ by\ solving\ above\ equation\ we\ get x=5\ or\   x=-9$