$$9x^2 + 25 - 30x$$ can be expressed as the square of:
$$9x^2+25-30x$$Â =Â $$9x^2-30x+25$$
                =  $$9x^2-15x-15x+25$$
                 = $$3x\left(3x-5\right)-5\left(3x-5\right)$$
                 = $$\left(3x-5\right)\left(3x-5\right)$$
                 =  $$\left(3x-5\right)^2$$                 Â
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