Hi All help with this one please is it correct:

(5-2x)²

(5-2x) (5-2x)

5 × 5, 5 × ¯2x, ¯2x × 5, ¯2x × ¯2x

10 + ¯10x + ¯10x + 4x

10 + 20x + 4x

= 10 + 24x

Thanks

2. Originally Posted by squidge
Hi All help with this one please is it correct:

(5-2x)²

(5-2x) (5-2x)

5 × 5, 5 × ¯2x, ¯2x × 5, ¯2x × ¯2x

10 + ¯10x + ¯10x + 4x

10 + 20x + 4x

= 10 + 24x

Thanks
Hello,

don't forget that $2x \cdot 2x = 4x^2$

The correct result should be: $(5-2x)^2 = 25 - 20x + 4x^2$