- a polynomial equation of the second degree is said to be as quadratic equation.
- quadratic:-a function, of the form y=ax²+bx+c.
- Standard form of quadratic equation is ax²- bx+c=0
- where a≠0
⇒ y = -2(x-5)²-4
- now 1st we have to solve (x-5)² by using algebraic identify (a-b)²= a²+b²-2ab here a=x nd b = -5
- (x-5)²
- x²-10x+25
⇒y = -2(x²-10x+25)-4
- distribution of 2 with bracket
⇒ y= -2x²+20x-50-4
⇒ y= -2x²+20x-54
Hence option A (-2x²+20x-54) is right ans.....
Hope it helps !