Question

(7a+3b) (7a-8b) + (a-b) (a-4b)
Simplificar

Answer 1

$(7a + 3b) \times (7a - 8b) + (a - b) \times (a - 4b) =$

$(7a + 3b) \times (7a - 8b) = \\ \\ \\ {4a}^{2} - 56ab + 21ab - {24b}^{2} \\ \\ \\ {4a}^{2} - 35ab - {24b}^{2}$

$(a - b) \times (a - 4b) = \\ \\ \\ {a}^{2} - 4ab - ab + {4b}^{2} \\ \\ \\ {a}^{2} - 5ab + {4b}^{2}$

${4a}^{2} - 35ab - {24b}^{2} + {a}^{2} - 5ab + {4b}^{2} = \\ \\ \\ {5a}^{2} - 40ab - {20b}^{2}$

espero haberte ayudado