Question

what must be added to get 4x²+7x+18 to get the sum of 15x²+8x-1?​

Answer 1

Step-by-step explanation:

let assume adding product as "y"

$4 {x}^{2} + 7x + 8 + (y) = 15 {x}^{2} + 8x - 1 \\ (y) = 15 {x}^{2} + 8x - 1 - (4 {x}^{2} + 7x + 8) \\ (y) = 15 {x}^{2} + 8x - 1 - 4 {x}^{2} - 7x - 8 \\ (y) = 11 {x}^{2} + x - 9$