Question

If a=(2x-5)and b=(2x+5),show that ab+25/4=xsq

Answer 1

Step-by-step explanation:

=> a×b=(2x-5)(2x+5)

We know that (x+y)×(x-y)=x²-y²

x=2x & y=5

=> ab=4x²-25

=> ab+25=4x²

=> (ab+25)÷4=x²