Problem 1. Write the following in the form ax2 + bx + c (i.e. foil these out). (a) (x+1)2
(b) (xβ1)2
(c) (x+2)2
(d) (xβ2)2 (e) τ°x+1τ°2
2 (f) τ°xβ21τ°2
(g) τ°x+43τ°2
(h) τ°xβ43τ°2
(i) τ°x+52τ°2
(j) τ°xβ52τ°2
(k) (x+a)2 (l) (xβa)2
Algebra II Homework 26
Problem 2. Notice that each of the above followed a consistent pattern. For instance (x β 3)2 = x2 β 6x + 9, so the first term is always x2, the last term is always the second part of the given number squared (β3)2 = 9 (and that itβs always positive), and that the second term is always 2 times that given number, 2(β3) = β6. Also notice that the second term is always and only negative if the given number is negative. Next to your answers above, verify this pattern by writing it in the form x2 + 2(β)x + (β)2 next to your originals. Here are a couple of examples of how your answers should look:
(A) (xβ3)2 =x2 β6x+9=x2 +2(β3)x+(β3)2 (B) (x+Ξ±)2 =x2 +2Ξ±x+Ξ±2 =x2 +2(Ξ±)x+(Ξ±)2
