Question

Please help me to solve this







PLEASE

Answer 1

$3x { }^{2} + 13 x + 3$

Answer 2

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Here is your answer
Let the number added is y

ATQ
$y + 5 {x}^{2} - 7x - 18 = 8 {x}^{2} + 6x - 15 \\ \\ y = 8 {x}^{2} + 6x - 15 - 5 {x}^{2} + 7x + 18 \\ \\y = 8 {x}^{2} - 5 {x}^{2} + 6x + 7x - 15 + 18 \\ \\ y = 3 {x}^{2} + 13x + 3$
Therefore Number should be added is
$3 {x}^{2} + 13x + 3$

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