Can anyone please check the following for me please
Expand (5 - 2x) Squared
(5 - 2x) (5 - 2x)
5 sqrd + 5 X - 2x + -2x x 5 + -2x X -2x
so
5 Sqrd - 10x - 10x + 4X
= 5 sqrd + 4x
Am I right..thank you :-)
No, you should use FOIL
F - multiply the Firsts
O - multiply the Outers
I - multiply the Inners
L - multiply the Lasts
so (5 - 2x) (5 - 2x)
= (5)(5) + (5)(-2x) + (-2x)(5) + (-2x)(-2x)
= 25 - 20x + 4x^2