Which equation is quadratic in form?
6(x + 2)2 + 8x + 2 + 1 = 0
6x4 + 7x2 – 3 = 0
5x6 + x4 + 12 = 0
x9 + x3 – 10 = 0

we know that

A quadratic equation is a polynomial with an order of two. Its general form is

case a)

The case a) is a quadratic equation

case b)

The case b) is a grade polynomial

case c)

The case c) is a grade polynomial

case d)

The case d) is a grade polynomial

therefore

the answer is

actually your concept is wrong

step-by-step explanation:

150% of x =300

150x=300×100

x=(300×100)÷150

x=200