Question

expand it (-2x + 7y)(-2x - 7y). please help me
the answer of this Q is 4 x square - 49 y square
. please I need to know how to solve I know the answer and also it would be solved by identity ​

Answer 1

Answer:

$by \: using \: formua \: (x + y)(x - y) = x ^{2} - y^{2} \\ = 4x^{2} - 49y^{2} \\ i \: hope \: it \: is \: helpfull \: you...........$