Question

simplify (2a+5b -c )×(3a +4b +7c )​

Answer 1

Step-by-step explanation:

$(2a + 5b - c) \times (3a + 4b + 7c) \\ 2a(3a+4b+7c) + 5b(3a+4b+7c) - c(3a+4b+7c) \\ 6 {a}^{2} + 8ab + 14ac + 15ab + 20 {b}^{2} + 35bc - 3ac - 4bc - 7 {c}^{2} \\ 6 {a}^{2} + 20 {b}^{2} - 7 {c}^{2} + 8ab + 15ab + 14ac - 3ac + 35bc - 4bc \\ 6 {a}^{2} + 20 {b}^{2} - 7 {c}^{2} + 23ab + 11ac + 31bc$

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