Question 536075
"Which values of b will make the expression x^2 + bx+400 a perfect square trinomial?"
a. -80,80 b.-40,40 c.-100,100 d.-20,20 



B. is the answer


x² + 40x + 400
= (x + 20)(x + 20) {when factored}
or (x - 20)(x - 20)
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