Expand the brackets.
25(5-y) -y
Expand and simplify.
x(5x-20)-y(20y-23)-70y
5x²-20x-20y²-23y-70y
5x²-20x-20y²-93y
5x²-20x+20y²-23y-70y
5x²-20x+20y²-93y
5x²-20x-20y²+23y-70y
5x²-20x-20y²+47y
(15x+200)(2x-30)
❌x²❌x+❌x❌
❌²❌-❌
(x+y)(x-y), for any value of y, equals x squared plus 2xy minus the value of y squared
For example (x+4)(x-4) = x squared + 8x - 16