Question

Multiply 15=a+2d and 25=2a+9d​

Answer 1

a+2d-15 = 0. ×

2a+9d -25 = 0

______________

(2a^2)+20ad + 375 = 0

Answer 2

Step-by-step explanation:

$15 = a + 2d - - (i)\\ 25 = 2a + 9d - - (ii) \\ multiply : \\ 15 \times 25 = (a + 2d)(2a + 9d) \\ 375 = 2 {a}^{2} + 9ad + 4ad + 18 {d}^{2} \\ 375 = 2 {a}^{2} + 13ad + 18 {d}^{2} \\ 0= 2 {a}^{2} + 18 {d}^{2}+ 13ad - 375$

HOPE THIS HELPS

MARK ME BRAINLIEST