Question

factorise 20x+25x²+4​

Answer 1

Answer:

(5x) ^2+2×5x×2+2^2

As we know that

(a+b) ^2= a^2+2ab+b^2

so ,

25 x^2+20x+4=(5x) ^2+2×5x×2+2^2

=(5x+2) ^2