Question

evaluate the following using the identity (a-b)^2
1. (px-q)^2
2. (2a-5b)^2
3, (98)^2

Answer 1

Step-by-step explanation:

1)

${(px - q)}^{2} = \\{ (px)}^{2} + {q}^{2} - 2pxq = \\ {p}^{2} {x}^{2} + {q}^{2} - 2pxq$

similarly substitute in (a-b)^2=

${a}^{2} + {b}^{2} - 2ab$