Question

1. (2×+5).(7×+4)
2. (2×-5).(7×+4)
3.(2×-5)+(7×-4)

Answer 1

1. (2x+5).(7x+4)
2x+5 + 7x+4
2x+7x+5+4
9x+9

2. (2x-5).(7x+4)
2x-5 + 7x+4
2x+7x-5+4
9x-1

3. (2x-5)+(7x-4)
2x+7x-5-4
9x-9

Answer 2

.= kali?
1. 2x(7x+4).5(7x+4)
= 14x^2 + 8x + 35x +20
= 14x^2 + 43x + 20

2. 2x(7x+4) -5(7x+4)
= 14x^2 + 8x -35x-20
= 14x^2 - 27x-20

3. (2x-5)+(7x-4)
= 2x -5 +7x-4
=9x -9

Semoga membantu ya^^