# Chapter 5 - Polynomials and Factoring - 5.4 Factoring Perfect-Square Trinomials and Differences of Squares - 5.4 Exercise Set: 77

prime

#### Work Step by Step

The second term in the given expression, $49a^4-20 ,$ is not a perfect square. Hence, it is not a difference of squares and cannot be factored. The given expression is $\text{ prime }.$

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