Answer: 9x16
Step-by-step explanation: The correct option is perfect square of 3x4 is 9x16.
Monomial is a product of numbers and variables in any whole power.
Examples of monomials: 5, y, 2x, 2x⁷, 2xyz, 6x²y¹⁰⁰.
Monomial cannot have log,subtraction or addition, negative power.
x/y=xy⁻¹
So, only monomial here is A.y
y=x^2-2x-15 (1) y=8x-40 (2)
8x-40=x^2-2x-15
X^2+10x-25=0
(x-5)^2
×=5 y=0
2.4 sould be your answer sorry if u no longer need this answered