Question

multiply
$(2a + 7b)(3 {a}^{2} - 7 {b}^{2} + 4 {c}^{2} )$
​

Answer 1

Answer:

$multiply : \\ (2a + 7b)(3 {a}^{2} - 7 {b}^{2} + 4 {c}^{2} ) \\ 2a(3 {a}^{2} - 7 {b}^{2} + 4 {c}^{2} ) + 7b(3 {a}^{2} - 7 {b}^{2} + 4 {c}^{2} ) \\ 6 {a}^{3} - {14ab}^{2} + 8 {ac}^{2} + 21 {a}^{2} b - 49 {b}^{3 } + 28b {c}^{2}$