Question

For the equation: $(x+2{)}^2=10x^2$, the quadratic coefficient is .

• A. 9
• B. 10
• C. 8
• D. 14

Answer 1

The correct option is A 9

Given equation: $(x+2{)}^2$ = 10$x^2$
$⟹x^2+4x+4=10x^2$
$⟹4x+4=10x^2-x^2$
$⟹4+4x=9x^2$
$⟹9x^2-4x-4=0$
In the above equation, the coefficient of $x^2$ is 9.
Hence, the quadratic coefficient in the above equation is 9 .