Question

check whether the following are quadratic equation x(x+1)+8=(x+2)(x-2)​

Answer 1

☛ x(x + 1) + 8 = (x + 2)(x - 2)

☛ x² + x + 8 = x² - 4 { (a + b)(a - b) = a² - b² }

☛ x² - x² + x + 8 + 4 = 0

☛ x + 12 = 0

Since, Degree of the equation is 1 therefore It is not a quadratic equation.

Answer 2

Hey mate ,

x(x+1) +8 = (x+2)(x-2)

x^2 + x +8 = x^2 -2^2 [ (a+b)(a-b) = a^2 - b^2 ]

x - 12 =0

Since ,

The greatest degree is not 2 thus it is not a quadratic equation !

Hope you find it helpful!!!

Do mark it as brainliest!!!