Question

simply(3a+4b+5c)×(2a-3b)​

Answer 1

Answer:

Starting with the second given equation;

3a + 5b + 7c = 30

(2a + 3b + 4c) + (a + 2b + 3c) = 30

35 + (a + 2b + 3c) = 30

a + 2b + 3c = -5______(1)

Now, using the first equation

2a + 3b + 4c = 35

( a + 2b + 3c) + (a + b + c)=35

-5 +(a + b + c)=35 [ using__(1)]

a + b +c=40

Answer 2

Step-by-step explanation:

(3a+4b+5c)×(2a-3b)

2a(3a+4b+5c)-3b(3a+4b+5c)

$6 {a}^{2} + 8ab + 10ac - 9ab - 12 {b}^{2} - 15bc$

$6 {a}^{2} - 12 {b}^{2} - 15bc + 10ac - ab$