Chapter 4.4, Problem 87S

To determine

Check whether the given trinomial is a perfect square or not.

Answer to Problem 87S

The given trinomial is not a perfect square.

Explanation of Solution

Given:

The given trinomial is $x^2-14x-49$ .

Calculation:

For perfect trinomial, the first and last terms need to be perfect squares and the middle term needs to be twice the product of the square roots of the first and last terms.

In the given trinomial $x^2-14x-49$ ,

the first $\left(1\right)$ term is a perfect square but the last term $\left(-49\right)$ is not a perfect square.

Check $\to$

Apply identity $x^2\pm 2xy+y^2={\left(x\pm y\right)}^2$

  $x^2-2\cdot 1\cdot 7x-{\left(7\right)}^2$ not satisfies the above identity.

Hence the given trinomial is not a perfect square.